diff --git a/src/dynamic_data/event_hooks.rs b/src/dynamic_data/event_hooks.rs
index 607b684..c9fa9a1 100755
--- a/src/dynamic_data/event_hooks.rs
+++ b/src/dynamic_data/event_hooks.rs
@@ -76,16 +76,16 @@ pub enum Event<'own> {
         /// The pokemon that changed species.
         pokemon: &'own Pokemon,
         /// The new species of the Pokemon.
-        species: Arc<Species>,
+        species: Arc<dyn Species>,
         /// The form of the species the Pokemon will have.
-        form: Arc<Form>,
+        form: Arc<dyn Form>,
     },
     /// This event happens when a Pokemon changes form during battle. This is rather common.
     FormChange {
         /// The pokemon that changed forms.
         pokemon: &'own Pokemon,
         /// The new form of the Pokemon.
-        form: &'own Form,
+        form: Arc<dyn Form>,
     },
     /// This event happens when a Pokemon takes damage.
     Damage {
diff --git a/src/dynamic_data/models/learned_move.rs b/src/dynamic_data/models/learned_move.rs
index 99fccfd..4b9239f 100755
--- a/src/dynamic_data/models/learned_move.rs
+++ b/src/dynamic_data/models/learned_move.rs
@@ -100,7 +100,7 @@ impl ValueIdentifiable for LearnedMove {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::static_data::MockMoveData;
+    use crate::static_data::tests::MockMoveData;
 
     #[test]
     fn create_learned_move_restore_uses() {
diff --git a/src/dynamic_data/models/pokemon.rs b/src/dynamic_data/models/pokemon.rs
index 1e4619d..e634356 100755
--- a/src/dynamic_data/models/pokemon.rs
+++ b/src/dynamic_data/models/pokemon.rs
@@ -32,16 +32,16 @@ pub struct Pokemon {
     /// The library data of the Pokemon.
     library: Arc<DynamicLibrary>,
     /// The species of the Pokemon.
-    species: RwLock<Arc<Species>>,
+    species: RwLock<Arc<dyn Species>>,
     /// The form of the Pokemon.
-    form: RwLock<Arc<Form>>,
+    form: RwLock<Arc<dyn Form>>,
 
     /// An optional display species of the Pokemon. If this is set, the client should display this
     /// species. An example of usage for this is the Illusion ability.
-    display_species: Option<Arc<Species>>,
+    display_species: Option<Arc<dyn Species>>,
     /// An optional display form of the Pokemon. If this is set, the client should display this
     //  species. An example of usage for this is the Illusion ability.
-    display_form: Option<Arc<Form>>,
+    display_form: Option<Arc<dyn Form>>,
 
     /// The current level of the Pokemon.
     level: Atomic<LevelInt>,
@@ -121,8 +121,8 @@ impl Pokemon {
     /// Instantiates a new Pokemon.
     pub fn new(
         library: Arc<DynamicLibrary>,
-        species: Arc<Species>,
-        form: &Arc<Form>,
+        species: Arc<dyn Species>,
+        form: &Arc<dyn Form>,
         ability: AbilityIndex,
         level: LevelInt,
         unique_identifier: u32,
@@ -192,15 +192,15 @@ impl Pokemon {
         &self.library
     }
     /// The species of the Pokemon.
-    pub fn species(&self) -> Arc<Species> {
+    pub fn species(&self) -> Arc<dyn Species> {
         self.species.read().clone()
     }
     /// The form of the Pokemon.
-    pub fn form(&self) -> Arc<Form> {
+    pub fn form(&self) -> Arc<dyn Form> {
         self.form.read().clone()
     }
     /// The species that should be displayed to the user. This handles stuff like the Illusion ability.
-    pub fn display_species(&self) -> Arc<Species> {
+    pub fn display_species(&self) -> Arc<dyn Species> {
         if let Some(v) = &self.display_species {
             v.clone()
         } else {
@@ -208,7 +208,7 @@ impl Pokemon {
         }
     }
     /// The form that should be displayed to the user. This handles stuff like the Illusion ability.
-    pub fn display_form(&self) -> Arc<Form> {
+    pub fn display_form(&self) -> Arc<dyn Form> {
         if let Some(v) = &self.display_form {
             v.clone()
         } else {
@@ -465,7 +465,7 @@ impl Pokemon {
     }
 
     /// Change the species of the Pokemon.
-    pub fn change_species(&self, species: Arc<Species>, form: Arc<Form>) {
+    pub fn change_species(&self, species: Arc<dyn Species>, form: Arc<dyn Form>) {
         *self.species.write() = species.clone();
         *self.form.write() = form.clone();
 
@@ -498,7 +498,7 @@ impl Pokemon {
     }
 
     /// Change the form of the Pokemon.
-    pub fn change_form(&self, form: &Arc<Form>) {
+    pub fn change_form(&self, form: &Arc<dyn Form>) {
         if self.form().value_identifier() == form.value_identifier() {
             return;
         }
@@ -542,7 +542,10 @@ impl Pokemon {
         let r = self.battle_data.read();
         if let Some(battle_data) = r.deref() {
             if let Some(battle) = battle_data.battle() {
-                battle.event_hook().trigger(Event::FormChange { pokemon: self, form })
+                battle.event_hook().trigger(Event::FormChange {
+                    pokemon: self,
+                    form: form.clone(),
+                })
             }
         }
     }
diff --git a/src/ffi/dynamic_data/models/pokemon.rs b/src/ffi/dynamic_data/models/pokemon.rs
index a9a56aa..ce100c6 100644
--- a/src/ffi/dynamic_data/models/pokemon.rs
+++ b/src/ffi/dynamic_data/models/pokemon.rs
@@ -12,8 +12,8 @@ use std::sync::Arc;
 #[no_mangle]
 extern "C" fn pokemon_new(
     library: ExternPointer<Arc<DynamicLibrary>>,
-    species: ExternPointer<Arc<Species>>,
-    form: ExternPointer<Arc<Form>>,
+    species: ExternPointer<Arc<dyn Species>>,
+    form: ExternPointer<Arc<dyn Form>>,
     hidden_ability: bool,
     ability_index: u8,
     level: LevelInt,
@@ -54,25 +54,25 @@ extern "C" fn pokemon_library(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiableP
 
 /// The species of the Pokemon.
 #[no_mangle]
-extern "C" fn pokemon_species(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<Species>> {
+extern "C" fn pokemon_species(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<dyn Species>> {
     ptr.as_ref().species().into()
 }
 
 /// The form of the Pokemon.
 #[no_mangle]
-extern "C" fn pokemon_form(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<Form>> {
+extern "C" fn pokemon_form(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<dyn Form>> {
     ptr.as_ref().form().into()
 }
 
 /// The species that should be displayed to the user. This handles stuff like the Illusion ability.
 #[no_mangle]
-extern "C" fn pokemon_display_species(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<Species>> {
+extern "C" fn pokemon_display_species(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<dyn Species>> {
     ptr.as_ref().display_species().into()
 }
 
 /// The form that should be displayed to the user. This handles stuff like the Illusion ability.
 #[no_mangle]
-extern "C" fn pokemon_display_form(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<Form>> {
+extern "C" fn pokemon_display_form(ptr: ExternPointer<Arc<Pokemon>>) -> IdentifiablePointer<Arc<dyn Form>> {
     ptr.as_ref().display_form().into()
 }
 
@@ -294,8 +294,8 @@ extern "C" fn pokemon_recalculate_boosted_stats(ptr: ExternPointer<Arc<Pokemon>>
 #[no_mangle]
 extern "C" fn pokemon_change_species(
     ptr: ExternPointer<Arc<Pokemon>>,
-    species: ExternPointer<Arc<Species>>,
-    form: ExternPointer<Arc<Form>>,
+    species: ExternPointer<Arc<dyn Species>>,
+    form: ExternPointer<Arc<dyn Form>>,
 ) {
     ptr.as_ref()
         .change_species(species.as_ref().clone(), form.as_ref().clone())
@@ -303,7 +303,7 @@ extern "C" fn pokemon_change_species(
 
 /// Change the form of the Pokemon.
 #[no_mangle]
-extern "C" fn pokemon_change_form(ptr: ExternPointer<Arc<Pokemon>>, form: ExternPointer<Arc<Form>>) {
+extern "C" fn pokemon_change_form(ptr: ExternPointer<Arc<Pokemon>>, form: ExternPointer<Arc<dyn Form>>) {
     ptr.as_ref().change_form(form.as_ref())
 }
 
diff --git a/src/ffi/mod.rs b/src/ffi/mod.rs
index 272d910..0acb584 100644
--- a/src/ffi/mod.rs
+++ b/src/ffi/mod.rs
@@ -58,7 +58,7 @@ macro_rules! ffi_vec_value_getters {
 /// length function, and a getter.
 macro_rules! ffi_vec_stringkey_getters {
     (
-        $type:ident, $func:ident
+        $type:ty, $func:ident
     ) => {
         paste::paste! {
             #[no_mangle]
diff --git a/src/ffi/static_data/form.rs b/src/ffi/static_data/form.rs
index d9bceb4..925e55d 100644
--- a/src/ffi/static_data/form.rs
+++ b/src/ffi/static_data/form.rs
@@ -2,7 +2,7 @@ use crate::ffi::{
     ffi_arc_getter, ffi_vec_stringkey_getters, ffi_vec_value_getters, BorrowedPtr, ExternPointer, IdentifiablePointer,
     OwnedPtr,
 };
-use crate::static_data::{Form, LearnableMoves, StaticStatisticSet, TypeIdentifier};
+use crate::static_data::{Form, FormImpl, LearnableMoves, StaticStatisticSet, TypeIdentifier};
 use crate::StringKey;
 use hashbrown::HashSet;
 use std::ffi::{c_char, CStr, CString};
@@ -26,7 +26,7 @@ unsafe extern "C" fn form_new(
     moves: OwnedPtr<Box<dyn LearnableMoves>>,
     flags: *const *const c_char,
     flags_length: usize,
-) -> IdentifiablePointer<Arc<Form>> {
+) -> IdentifiablePointer<Arc<dyn Form>> {
     let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
 
     let abilities = std::slice::from_raw_parts(abilities, abilities_length);
@@ -46,7 +46,7 @@ unsafe extern "C" fn form_new(
         flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
     }
 
-    Arc::new(Form::new(
+    let a: Arc<dyn Form> = Arc::new(FormImpl::new(
         &name,
         height,
         weight,
@@ -57,47 +57,49 @@ unsafe extern "C" fn form_new(
         hidden_abilities_vec,
         *Box::from_raw(moves),
         flags_set,
-    ))
-    .into()
+    ));
+    a.into()
 }
 
 /// Drops a reference count for a form.
 #[no_mangle]
-unsafe extern "C" fn form_drop(ptr: OwnedPtr<Arc<Form>>) {
+unsafe extern "C" fn form_drop(ptr: OwnedPtr<Arc<dyn Form>>) {
     drop_in_place(ptr)
 }
 
 /// The name of the form.
 #[no_mangle]
-unsafe extern "C" fn form_name(ptr: ExternPointer<Arc<Form>>) -> OwnedPtr<c_char> {
+unsafe extern "C" fn form_name(ptr: ExternPointer<Arc<dyn Form>>) -> OwnedPtr<c_char> {
     let name = ptr.as_ref().name();
     CString::new(name.str()).unwrap().into_raw()
 }
 
-ffi_arc_getter!(Form, height, f32);
-ffi_arc_getter!(Form, weight, f32);
-ffi_arc_getter!(Form, base_experience, u32);
+ffi_arc_getter!(dyn Form, height, f32);
+ffi_arc_getter!(dyn Form, weight, f32);
+ffi_arc_getter!(dyn Form, base_experience, u32);
 
-ffi_vec_value_getters!(Form, types, TypeIdentifier);
+ffi_vec_value_getters!(dyn Form, types, TypeIdentifier);
 
 /// The inherent values of a form of species that are used for the stats of a Pokemon.
 #[no_mangle]
-unsafe extern "C" fn form_base_stats(ptr: ExternPointer<Arc<Form>>) -> IdentifiablePointer<StaticStatisticSet<u16>> {
+unsafe extern "C" fn form_base_stats(
+    ptr: ExternPointer<Arc<dyn Form>>,
+) -> IdentifiablePointer<StaticStatisticSet<u16>> {
     (ptr.as_ref().base_stats() as *const StaticStatisticSet<u16>).into()
 }
 
-ffi_vec_stringkey_getters!(Form, abilities);
-ffi_vec_stringkey_getters!(Form, hidden_abilities);
+ffi_vec_stringkey_getters!(dyn Form, abilities);
+ffi_vec_stringkey_getters!(dyn Form, hidden_abilities);
 
 /// The moves a Pokemon with this form can learn.
 #[no_mangle]
-extern "C" fn form_moves(ptr: ExternPointer<Arc<Form>>) -> BorrowedPtr<Box<dyn LearnableMoves>> {
+extern "C" fn form_moves(ptr: ExternPointer<Arc<dyn Form>>) -> BorrowedPtr<Box<dyn LearnableMoves>> {
     ptr.as_ref().moves() as *const Box<dyn LearnableMoves>
 }
 
 /// Check if the form has a specific flag set.
 #[no_mangle]
-unsafe extern "C" fn form_has_flag(ptr: ExternPointer<Arc<Form>>, flag: *const c_char) -> u8 {
+unsafe extern "C" fn form_has_flag(ptr: ExternPointer<Arc<dyn Form>>, flag: *const c_char) -> u8 {
     let flag = CStr::from_ptr(flag).into();
     u8::from(ptr.as_ref().has_flag(&flag))
 }
diff --git a/src/ffi/static_data/libraries/mod.rs b/src/ffi/static_data/libraries/mod.rs
index e1c7b52..1b54cac 100644
--- a/src/ffi/static_data/libraries/mod.rs
+++ b/src/ffi/static_data/libraries/mod.rs
@@ -72,7 +72,7 @@ macro_rules! library_interface {
     };
 }
 
-library_interface!(SpeciesLibrary, Species);
+library_interface!(SpeciesLibrary, dyn Species);
 library_interface!(MoveLibrary, dyn MoveData);
 library_interface!(AbilityLibrary, dyn Ability);
 library_interface!(ItemLibrary, dyn Item);
diff --git a/src/ffi/static_data/species.rs b/src/ffi/static_data/species.rs
index af8d605..358e74b 100644
--- a/src/ffi/static_data/species.rs
+++ b/src/ffi/static_data/species.rs
@@ -1,5 +1,5 @@
 use crate::ffi::{ffi_arc_getter, ffi_arc_stringkey_getter, BorrowedPtr, ExternPointer, IdentifiablePointer, OwnedPtr};
-use crate::static_data::{Form, Species};
+use crate::static_data::{Form, Species, SpeciesImpl};
 use crate::StringKey;
 use hashbrown::HashSet;
 use std::ffi::{c_char, CStr};
@@ -14,10 +14,10 @@ unsafe extern "C" fn species_new(
     gender_rate: f32,
     growth_rate: BorrowedPtr<c_char>,
     capture_rate: u8,
-    default_form: OwnedPtr<Arc<Form>>,
+    default_form: OwnedPtr<Arc<dyn Form>>,
     flags: *const *const c_char,
     flags_length: usize,
-) -> IdentifiablePointer<Arc<Species>> {
+) -> IdentifiablePointer<Arc<dyn Species>> {
     let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
     let growth_rate: StringKey = CStr::from_ptr(growth_rate).to_str().unwrap().into();
 
@@ -26,7 +26,7 @@ unsafe extern "C" fn species_new(
     for flag in flags {
         flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
     }
-    Arc::new(Species::new(
+    let a: Arc<dyn Species> = Arc::new(SpeciesImpl::new(
         id,
         &name,
         gender_rate,
@@ -34,28 +34,28 @@ unsafe extern "C" fn species_new(
         capture_rate,
         default_form.as_ref().unwrap().clone(),
         flags_set,
-    ))
-    .into()
+    ));
+    a.into()
 }
 
 /// Drop a reference to the species.
 #[no_mangle]
-unsafe extern "C" fn species_drop(ptr: OwnedPtr<Arc<Species>>) {
+unsafe extern "C" fn species_drop(ptr: OwnedPtr<Arc<dyn Species>>) {
     drop_in_place(ptr);
 }
 
-ffi_arc_getter!(Species, id, u16);
-ffi_arc_stringkey_getter!(Species, name);
-ffi_arc_getter!(Species, gender_rate, f32);
-ffi_arc_stringkey_getter!(Species, growth_rate);
-ffi_arc_getter!(Species, capture_rate, u8);
+ffi_arc_getter!(dyn Species, id, u16);
+ffi_arc_stringkey_getter!(dyn Species, name);
+ffi_arc_getter!(dyn Species, gender_rate, f32);
+ffi_arc_stringkey_getter!(dyn Species, growth_rate);
+ffi_arc_getter!(dyn Species, capture_rate, u8);
 
 /// Adds a new form to the species.
 #[no_mangle]
 unsafe extern "C" fn species_add_form(
-    mut species: ExternPointer<Arc<Species>>,
+    mut species: ExternPointer<Arc<dyn Species>>,
     name: BorrowedPtr<c_char>,
-    form: OwnedPtr<Arc<Form>>,
+    form: OwnedPtr<Arc<dyn Form>>,
 ) {
     let form = form.as_ref().unwrap().clone();
     species.as_mut().add_form(CStr::from_ptr(name).into(), form)
@@ -64,9 +64,9 @@ unsafe extern "C" fn species_add_form(
 /// Gets a form by name.
 #[no_mangle]
 unsafe extern "C" fn species_get_form(
-    species: ExternPointer<Arc<Species>>,
+    species: ExternPointer<Arc<dyn Species>>,
     name: BorrowedPtr<c_char>,
-) -> IdentifiablePointer<Arc<Form>> {
+) -> IdentifiablePointer<Arc<dyn Form>> {
     let form = species.as_ref().get_form(&CStr::from_ptr(name).into());
     if let Some(form) = form {
         form.into()
diff --git a/src/script_implementations/wasm/export_registry/dynamic_data/pokemon.rs b/src/script_implementations/wasm/export_registry/dynamic_data/pokemon.rs
index 055c62f..79d6294 100755
--- a/src/script_implementations/wasm/export_registry/dynamic_data/pokemon.rs
+++ b/src/script_implementations/wasm/export_registry/dynamic_data/pokemon.rs
@@ -63,7 +63,7 @@ register! {
     fn pokemon_get_species(
         env: FunctionEnvMut<WebAssemblyEnv>,
         pokemon: ExternRef<Pokemon>,
-    ) -> ExternRef<Species> {
+    ) -> ExternRef<dyn Species> {
         let species = pokemon.value_func(&env).unwrap().species();
         ExternRef::func_new(&env, &species)
     }
diff --git a/src/script_implementations/wasm/export_registry/static_data/species.rs b/src/script_implementations/wasm/export_registry/static_data/species.rs
index 5b18814..02ef3e1 100755
--- a/src/script_implementations/wasm/export_registry/static_data/species.rs
+++ b/src/script_implementations/wasm/export_registry/static_data/species.rs
@@ -11,7 +11,7 @@ fn species_library_get_species(
     env: FunctionEnvMut<WebAssemblyEnv>,
     lib: ExternRef<SpeciesLibrary>,
     string_key: ExternRef<StringKey>,
-) -> ExternRef<Species> {
+) -> ExternRef<dyn Species> {
     let lib = lib.value_func(&env).unwrap();
     let m = lib.get(string_key.value_func(&env).unwrap());
     if let Some(v) = m {
@@ -23,39 +23,39 @@ fn species_library_get_species(
 
 fn species_get_capture_rate(
     env: FunctionEnvMut<WebAssemblyEnv>,
-    species: ExternRef<Species>,
+    species: ExternRef<dyn Species>,
 ) -> u8 {
-    species.value_func(&env).unwrap().capture_rate()
+    species.value_func_arc(&env).unwrap().capture_rate()
 }
 
 fn species_get_growth_rate(
     env: FunctionEnvMut<WebAssemblyEnv>,
-    species: ExternRef<Species>,
+    species: ExternRef<dyn Species>,
 ) -> ExternRef<StringKey> {
-    let species = species.value_func(&env).unwrap();
+    let species = species.value_func_arc(&env).unwrap();
     ExternRef::func_new(&env, species.growth_rate())
 }
 
 fn species_get_gender_rate(
     env: FunctionEnvMut<WebAssemblyEnv>,
-    species: ExternRef<Species>,
+    species: ExternRef<dyn Species>,
 ) -> f32 {
-    species.value_func(&env).unwrap().gender_rate()
+    species.value_func_arc(&env).unwrap().gender_rate()
 }
 
 fn species_get_name(
     env: FunctionEnvMut<WebAssemblyEnv>,
-    species: ExternRef<Species>,
+    species: ExternRef<dyn Species>,
 ) -> ExternRef<StringKey> {
-    let species = species.value_func(&env).unwrap();
+    let species = species.value_func_arc(&env).unwrap();
     ExternRef::func_new(&env, species.name())
 }
 
 fn species_get_id(
     env: FunctionEnvMut<WebAssemblyEnv>,
-    species: ExternRef<Species>,
+    species: ExternRef<dyn Species>,
 ) -> u16 {
-    species.value_func(&env).unwrap().id()
+    species.value_func_arc(&env).unwrap().id()
 }
 
 
diff --git a/src/static_data/growth_rates.rs b/src/static_data/growth_rates.rs
index f6321ec..172afdf 100755
--- a/src/static_data/growth_rates.rs
+++ b/src/static_data/growth_rates.rs
@@ -40,3 +40,17 @@ impl GrowthRate for LookupGrowthRate {
         }
     }
 }
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+
+    mockall::mock! {
+        #[derive(Debug)]
+        pub GrowthRate {}
+        impl GrowthRate for GrowthRate {
+            fn calculate_level(&self, experience: u32) -> LevelInt;
+            fn calculate_experience(&self, level: LevelInt) -> u32;
+        }
+    }
+}
diff --git a/src/static_data/items.rs b/src/static_data/items.rs
index 9397567..b900b83 100755
--- a/src/static_data/items.rs
+++ b/src/static_data/items.rs
@@ -133,3 +133,26 @@ impl ValueIdentifiable for ItemImpl {
         self.identifier
     }
 }
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+
+    mockall::mock! {
+        #[derive(Debug)]
+        pub Item {}
+        impl Item for Item {
+            fn name(&self) -> &StringKey;
+            fn category(&self) -> ItemCategory;
+            fn battle_category(&self) -> BattleItemCategory;
+            fn price(&self) -> i32;
+            fn flags(&self) -> &HashSet<StringKey>;
+            fn has_flag(&self, key: &StringKey) -> bool;
+        }
+        impl ValueIdentifiable for Item {
+            fn value_identifier(&self) -> ValueIdentifier {
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+}
diff --git a/src/static_data/libraries/mod.rs b/src/static_data/libraries/mod.rs
index 8bf6976..374108c 100755
--- a/src/static_data/libraries/mod.rs
+++ b/src/static_data/libraries/mod.rs
@@ -19,6 +19,9 @@ pub use static_data::StaticData;
 #[doc(inline)]
 pub use type_library::*;
 
+#[cfg(test)]
+pub(crate) mod tests {}
+
 /// The library data for abilities.
 mod ability_library;
 /// Basic helper trait for libraries.
diff --git a/src/static_data/libraries/species_library.rs b/src/static_data/libraries/species_library.rs
index c0dbbd6..31a9682 100755
--- a/src/static_data/libraries/species_library.rs
+++ b/src/static_data/libraries/species_library.rs
@@ -13,7 +13,7 @@ pub struct SpeciesLibrary {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The underlying map.
-    map: IndexMap<StringKey, Arc<Species>>,
+    map: IndexMap<StringKey, Arc<dyn Species>>,
 }
 
 impl SpeciesLibrary {
@@ -26,11 +26,11 @@ impl SpeciesLibrary {
     }
 }
 
-impl DataLibrary<Species> for SpeciesLibrary {
-    fn map(&self) -> &IndexMap<StringKey, Arc<Species>> {
+impl DataLibrary<dyn Species> for SpeciesLibrary {
+    fn map(&self) -> &IndexMap<StringKey, Arc<dyn Species>> {
         &self.map
     }
-    fn get_modify(&mut self) -> &mut IndexMap<StringKey, Arc<Species>> {
+    fn get_modify(&mut self) -> &mut IndexMap<StringKey, Arc<dyn Species>> {
         &mut self.map
     }
 }
@@ -48,18 +48,18 @@ pub mod tests {
 
     use crate::static_data::libraries::data_library::DataLibrary;
     use crate::static_data::libraries::species_library::SpeciesLibrary;
-    use crate::static_data::Species;
-    use crate::static_data::StaticStatisticSet;
-    use crate::static_data::{Form, LearnableMovesImpl};
+    use crate::static_data::LearnableMovesImpl;
+    use crate::static_data::{FormImpl, StaticStatisticSet};
+    use crate::static_data::{Species, SpeciesImpl};
 
-    fn build_species() -> Species {
-        Species::new(
+    fn build_species() -> Arc<dyn Species> {
+        Arc::new(SpeciesImpl::new(
             0,
             &"foo".into(),
             0.5,
             &"test_growthrate".into(),
             0,
-            Arc::new(Form::new(
+            Arc::new(FormImpl::new(
                 &"default".into(),
                 0.0,
                 0.0,
@@ -72,7 +72,7 @@ pub mod tests {
                 HashSet::new(),
             )),
             HashSet::new(),
-        )
+        ))
     }
 
     pub fn build() -> SpeciesLibrary {
@@ -80,7 +80,7 @@ pub mod tests {
         let species = build_species();
         // Borrow as mut so we can insert
         let w = &mut lib;
-        w.add(&"foo".into(), Arc::new(species));
+        w.add(&"foo".into(), species);
         // Drops borrow as mut
 
         lib
diff --git a/src/static_data/mod.rs b/src/static_data/mod.rs
index ac208d8..5ef885b 100755
--- a/src/static_data/mod.rs
+++ b/src/static_data/mod.rs
@@ -17,6 +17,23 @@ pub use statistic_set::*;
 pub use statistics::*;
 use std::fmt::{Display, Formatter};
 
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+    #[doc(inline)]
+    pub use growth_rates::tests::*;
+    #[doc(inline)]
+    pub use items::tests::*;
+    #[doc(inline)]
+    pub use libraries::tests::*;
+    #[doc(inline)]
+    pub use moves::tests::*;
+    #[doc(inline)]
+    pub use natures::tests::*;
+    #[doc(inline)]
+    pub use species_data::tests::*;
+}
+
 /// Growth rates define how fast a Pokemon can level up.
 mod growth_rates;
 /// Items are objects which the player can pick up, keep in their Bag, and use in some manner
diff --git a/src/static_data/moves/mod.rs b/src/static_data/moves/mod.rs
index 5d23601..bd16a64 100755
--- a/src/static_data/moves/mod.rs
+++ b/src/static_data/moves/mod.rs
@@ -3,6 +3,16 @@ pub use move_data::*;
 #[doc(inline)]
 pub use secondary_effect::*;
 
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+
+    #[doc(inline)]
+    pub use move_data::tests::*;
+    #[doc(inline)]
+    pub use secondary_effect::tests::*;
+}
+
 /// The data belonging to a certain move.
 mod move_data;
 /// A secondary effect is an effect on a move that happens after it hits.
diff --git a/src/static_data/moves/move_data.rs b/src/static_data/moves/move_data.rs
index 73c6c60..6aba0d5 100755
--- a/src/static_data/moves/move_data.rs
+++ b/src/static_data/moves/move_data.rs
@@ -208,25 +208,29 @@ impl ValueIdentifiable for MoveDataImpl {
 }
 
 #[cfg(test)]
-mockall::mock! {
-    #[derive(Debug)]
-    pub MoveData{}
-    impl MoveData for MoveData {
-        fn name(&self) -> &StringKey;
-        fn move_type(&self) -> TypeIdentifier;
-        fn category(&self) -> MoveCategory;
-        fn base_power(&self) -> u8;
-        fn accuracy(&self) -> u8;
-        fn base_usages(&self) -> u8;
-        fn target(&self) -> MoveTarget;
-        fn priority(&self) -> i8;
-        fn secondary_effect(&self) -> &Option<Box<dyn SecondaryEffect>>;
-        fn has_flag(&self, key: &StringKey) -> bool;
-        fn has_flag_by_hash(&self, key_hash: u32) -> bool;
-    }
-    impl ValueIdentifiable for MoveData{
-        fn value_identifier(&self) -> ValueIdentifier{
-            ValueIdentifier::new(0)
+pub(crate) mod tests {
+    use super::*;
+
+    mockall::mock! {
+        #[derive(Debug)]
+        pub MoveData{}
+        impl MoveData for MoveData {
+            fn name(&self) -> &StringKey;
+            fn move_type(&self) -> TypeIdentifier;
+            fn category(&self) -> MoveCategory;
+            fn base_power(&self) -> u8;
+            fn accuracy(&self) -> u8;
+            fn base_usages(&self) -> u8;
+            fn target(&self) -> MoveTarget;
+            fn priority(&self) -> i8;
+            fn secondary_effect(&self) -> &Option<Box<dyn SecondaryEffect>>;
+            fn has_flag(&self, key: &StringKey) -> bool;
+            fn has_flag_by_hash(&self, key_hash: u32) -> bool;
+        }
+        impl ValueIdentifiable for MoveData{
+            fn value_identifier(&self) -> ValueIdentifier{
+                ValueIdentifier::new(0)
+            }
         }
     }
 }
diff --git a/src/static_data/moves/secondary_effect.rs b/src/static_data/moves/secondary_effect.rs
index fa5c21b..c3f0add 100755
--- a/src/static_data/moves/secondary_effect.rs
+++ b/src/static_data/moves/secondary_effect.rs
@@ -59,12 +59,28 @@ impl ValueIdentifiable for SecondaryEffectImpl {
 }
 
 #[cfg(test)]
-mod tests {
+pub(crate) mod tests {
+    use super::*;
     use assert_approx_eq::assert_approx_eq;
 
     use crate::static_data::moves::secondary_effect::SecondaryEffect;
     use crate::static_data::SecondaryEffectImpl;
 
+    mockall::mock! {
+        #[derive(Debug)]
+        pub SecondaryEffect{}
+        impl SecondaryEffect for SecondaryEffect {
+            fn chance(&self) -> f32;
+            fn effect_name(&self) -> &StringKey;
+            fn parameters(&self) -> &Vec<EffectParameter>;
+        }
+        impl ValueIdentifiable for SecondaryEffect{
+            fn value_identifier(&self) -> ValueIdentifier{
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+
     #[test]
     fn create_secondary_effect() {
         let empty = SecondaryEffectImpl::new(0.0, "".into(), vec![]);
diff --git a/src/static_data/natures.rs b/src/static_data/natures.rs
index 0c8072a..e80aff8 100755
--- a/src/static_data/natures.rs
+++ b/src/static_data/natures.rs
@@ -80,3 +80,23 @@ impl ValueIdentifiable for NatureImpl {
         self.identifier
     }
 }
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+
+    mockall::mock! {
+        #[derive(Debug)]
+        pub Nature {}
+        impl Nature for Nature {
+            fn increased_stat(&self) -> Statistic;
+            fn decreased_stat(&self) -> Statistic;
+            fn get_stat_modifier(&self, stat: Statistic) -> f32;
+        }
+        impl ValueIdentifiable for Nature {
+            fn value_identifier(&self) -> ValueIdentifier {
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+}
diff --git a/src/static_data/species_data/ability.rs b/src/static_data/species_data/ability.rs
index 6fb8e72..2251b4a 100755
--- a/src/static_data/species_data/ability.rs
+++ b/src/static_data/species_data/ability.rs
@@ -68,3 +68,23 @@ pub struct AbilityIndex {
     /// The index of the ability.
     pub index: u8,
 }
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+
+    mockall::mock! {
+        #[derive(Debug)]
+        pub Ability{}
+        impl Ability for Ability {
+            fn name(&self) -> &StringKey;
+            fn effect(&self) -> &StringKey;
+            fn parameters(&self) -> &Vec<EffectParameter>;
+        }
+        impl ValueIdentifiable for Ability {
+            fn value_identifier(&self) -> ValueIdentifier {
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+}
diff --git a/src/static_data/species_data/form.rs b/src/static_data/species_data/form.rs
index 507a4be..8dd3239 100755
--- a/src/static_data/species_data/form.rs
+++ b/src/static_data/species_data/form.rs
@@ -1,4 +1,5 @@
 use hashbrown::HashSet;
+use std::fmt::Debug;
 
 use crate::static_data::Statistic;
 use crate::static_data::TypeIdentifier;
@@ -7,10 +8,56 @@ use crate::static_data::{AbilityIndex, LearnableMoves};
 use crate::StringKey;
 use crate::{Random, ValueIdentifiable, ValueIdentifier};
 
+/// A form is a variant of a specific species. A species always has at least one form, but can have
+/// many more.
+pub trait Form: ValueIdentifiable + Debug {
+    /// The name of the form.
+    fn name(&self) -> &StringKey;
+    /// The height of the form in meters.
+    fn height(&self) -> f32;
+    /// The weight of the form in kilograms.
+    fn weight(&self) -> f32;
+    /// The base amount of experience that is gained when beating a Pokemon with this form.
+    fn base_experience(&self) -> u32;
+    /// The normal types a Pokemon with this form has.
+    fn types(&self) -> &Vec<TypeIdentifier>;
+    /// The inherent values of a form of species that are used for the stats of a Pokemon.
+    fn base_stats(&self) -> &StaticStatisticSet<u16>;
+    /// The possible abilities a Pokemon with this form can have.
+    fn abilities(&self) -> &Vec<StringKey>;
+    /// The possible hidden abilities a Pokemon with this form can have.
+    fn hidden_abilities(&self) -> &Vec<StringKey>;
+
+    #[allow(clippy::borrowed_box)]
+    /// The moves a Pokemon with this form can learn.
+    fn moves(&self) -> &Box<dyn LearnableMoves>;
+    /// Arbitrary flags can be set on a form for scripting use.
+    fn flags(&self) -> &HashSet<StringKey>;
+
+    /// Get a type of the move at a certain index.
+    fn get_type(&self, index: usize) -> TypeIdentifier;
+
+    /// Gets a single base stat value.
+    fn get_base_stat(&self, stat: Statistic) -> u16;
+    /// Find the index of an ability that can be on this form.
+    fn find_ability_index(&self, ability: &dyn Ability) -> Option<AbilityIndex>;
+
+    /// Gets an ability from the form.
+    fn get_ability(&self, index: AbilityIndex) -> &StringKey;
+
+    /// Gets a random ability from the form.
+    fn get_random_ability(&self, rand: &mut Random) -> &StringKey;
+    /// Gets a random hidden ability from the form.
+    fn get_random_hidden_ability(&self, rand: &mut Random) -> &StringKey;
+
+    /// Check if the form has a specific flag set.
+    fn has_flag(&self, key: &StringKey) -> bool;
+}
+
 /// A form is a variant of a specific species. A species always has at least one form, but can have
 /// many more.
 #[derive(Debug)]
-pub struct Form {
+pub struct FormImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The name of the form.
@@ -35,7 +82,7 @@ pub struct Form {
     flags: HashSet<StringKey>,
 }
 
-impl Form {
+impl FormImpl {
     /// Instantiates a new form.
     pub fn new(
         name: &StringKey,
@@ -48,8 +95,8 @@ impl Form {
         hidden_abilities: Vec<StringKey>,
         moves: Box<dyn LearnableMoves>,
         flags: HashSet<StringKey>,
-    ) -> Form {
-        Form {
+    ) -> Self {
+        Self {
             identifier: Default::default(),
             name: name.clone(),
             height,
@@ -63,62 +110,64 @@ impl Form {
             flags,
         }
     }
+}
 
+impl Form for FormImpl {
     /// The name of the form.
-    pub fn name(&self) -> &StringKey {
+    fn name(&self) -> &StringKey {
         &self.name
     }
     /// The height of the form in meters.
-    pub fn height(&self) -> f32 {
+    fn height(&self) -> f32 {
         self.height
     }
     /// The weight of the form in kilograms.
-    pub fn weight(&self) -> f32 {
+    fn weight(&self) -> f32 {
         self.weight
     }
     /// The base amount of experience that is gained when beating a Pokemon with this form.
-    pub fn base_experience(&self) -> u32 {
+    fn base_experience(&self) -> u32 {
         self.base_experience
     }
     /// The normal types a Pokemon with this form has.
-    pub fn types(&self) -> &Vec<TypeIdentifier> {
+    fn types(&self) -> &Vec<TypeIdentifier> {
         &self.types
     }
     /// The inherent values of a form of species that are used for the stats of a Pokemon.
-    pub fn base_stats(&self) -> &StaticStatisticSet<u16> {
+    fn base_stats(&self) -> &StaticStatisticSet<u16> {
         &self.base_stats
     }
     /// The possible abilities a Pokemon with this form can have.
-    pub fn abilities(&self) -> &Vec<StringKey> {
+    fn abilities(&self) -> &Vec<StringKey> {
         &self.abilities
     }
     /// The possible hidden abilities a Pokemon with this form can have.
-    pub fn hidden_abilities(&self) -> &Vec<StringKey> {
+    fn hidden_abilities(&self) -> &Vec<StringKey> {
         &self.hidden_abilities
     }
 
     #[allow(clippy::borrowed_box)]
     /// The moves a Pokemon with this form can learn.
-    pub fn moves(&self) -> &Box<dyn LearnableMoves> {
+    fn moves(&self) -> &Box<dyn LearnableMoves> {
         &self.moves
     }
     /// Arbitrary flags can be set on a form for scripting use.
-    pub fn flags(&self) -> &HashSet<StringKey> {
+    fn flags(&self) -> &HashSet<StringKey> {
         &self.flags
     }
 
     /// Get a type of the move at a certain index.
-    pub fn get_type(&self, index: usize) -> TypeIdentifier {
+    fn get_type(&self, index: usize) -> TypeIdentifier {
         self.types[index]
     }
 
     /// Gets a single base stat value.
-    pub fn get_base_stat(&self, stat: Statistic) -> u16 {
+    fn get_base_stat(&self, stat: Statistic) -> u16 {
         self.base_stats.get_stat(stat)
     }
 
     /// Find the index of an ability that can be on this form.
-    pub fn find_ability_index(&self, ability: &dyn Ability) -> Option<AbilityIndex> {
+    fn find_ability_index(&self, ability: &dyn Ability) -> Option<AbilityIndex> {
         for (index, a) in self.abilities.iter().enumerate() {
             if a == ability.name() {
                 return Some(AbilityIndex {
@@ -139,7 +188,7 @@ impl Form {
     }
 
     /// Gets an ability from the form.
-    pub fn get_ability(&self, index: AbilityIndex) -> &StringKey {
+    fn get_ability(&self, index: AbilityIndex) -> &StringKey {
         if index.hidden {
             &self.hidden_abilities[index.index as usize]
         } else {
@@ -148,22 +197,57 @@ impl Form {
     }
 
     /// Gets a random ability from the form.
-    pub fn get_random_ability(&self, rand: &mut Random) -> &StringKey {
+    fn get_random_ability(&self, rand: &mut Random) -> &StringKey {
         &self.abilities[rand.get_between_unsigned(0, self.abilities.len() as u32) as usize]
     }
     /// Gets a random hidden ability from the form.
-    pub fn get_random_hidden_ability(&self, rand: &mut Random) -> &StringKey {
+    fn get_random_hidden_ability(&self, rand: &mut Random) -> &StringKey {
         &self.hidden_abilities[rand.get_between_unsigned(0, self.hidden_abilities.len() as u32) as usize]
     }
 
     /// Check if the form has a specific flag set.
-    pub fn has_flag(&self, key: &StringKey) -> bool {
+    fn has_flag(&self, key: &StringKey) -> bool {
         self.flags.contains(key)
     }
 }
 
-impl ValueIdentifiable for Form {
+impl ValueIdentifiable for FormImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
 }
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+
+    mockall::mock! {
+        #[derive(Debug)]
+        pub Form {}
+        impl Form for Form {
+            fn name(&self) -> &StringKey;
+            fn height(&self) -> f32;
+            fn weight(&self) -> f32;
+            fn base_experience(&self) -> u32;
+            fn types(&self) -> &Vec<TypeIdentifier>;
+            fn base_stats(&self) -> &StaticStatisticSet<u16>;
+            fn abilities(&self) -> &Vec<StringKey>;
+            fn hidden_abilities(&self) -> &Vec<StringKey>;
+            #[allow(clippy::borrowed_box)]
+            fn moves(&self) -> &Box<dyn LearnableMoves>;
+            fn flags(&self) -> &HashSet<StringKey>;
+            fn get_type(&self, index: usize) -> TypeIdentifier;
+            fn get_base_stat(&self, stat: Statistic) -> u16;
+            fn find_ability_index(&self, ability: &dyn Ability) -> Option<AbilityIndex>;
+            fn get_ability(&self, index: AbilityIndex) -> &StringKey;
+            fn get_random_ability(&self, rand: &mut Random) -> &StringKey;
+            fn get_random_hidden_ability(&self, rand: &mut Random) -> &StringKey;
+            fn has_flag(&self, key: &StringKey) -> bool;
+        }
+        impl ValueIdentifiable for Form {
+            fn value_identifier(&self) -> ValueIdentifier {
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+}
diff --git a/src/static_data/species_data/learnable_moves.rs b/src/static_data/species_data/learnable_moves.rs
index 211fa5c..0d92ff0 100755
--- a/src/static_data/species_data/learnable_moves.rs
+++ b/src/static_data/species_data/learnable_moves.rs
@@ -59,9 +59,8 @@ impl LearnableMoves for LearnableMovesImpl {
 }
 
 #[cfg(test)]
-mod tests {
-    use crate::static_data::species_data::learnable_moves::LearnableMoves;
-    use crate::static_data::LearnableMovesImpl;
+pub(crate) mod tests {
+    use super::*;
 
     #[test]
     fn adds_level_moves() {
@@ -92,4 +91,12 @@ mod tests {
         assert_eq!(distinct.len(), 1);
         assert_eq!(distinct[0], "foo".into());
     }
+
+    mockall::mock! {
+        pub LearnableMoves {
+            fn add_level_move(&mut self, level: LevelInt, m: &StringKey);
+            fn get_learned_by_level<'a>(&'a self, level: LevelInt) -> Option<&'a Vec<StringKey>>;
+            fn get_distinct_level_moves(&self) -> &Vec<StringKey>;
+        }
+    }
 }
diff --git a/src/static_data/species_data/mod.rs b/src/static_data/species_data/mod.rs
index 99b0604..b5254cc 100755
--- a/src/static_data/species_data/mod.rs
+++ b/src/static_data/species_data/mod.rs
@@ -9,6 +9,14 @@ pub use learnable_moves::*;
 #[doc(inline)]
 pub use species::*;
 
+#[cfg(test)]
+pub(crate) mod tests {
+    pub use super::ability::tests::*;
+    pub use super::form::tests::*;
+    pub use super::learnable_moves::tests::*;
+    pub use super::species::tests::*;
+}
+
 /// An ability is a passive effect in battle that is attached to a Pokemon.
 mod ability;
 /// A form is a variant of a specific species. A species always has at least one form, but can have
diff --git a/src/static_data/species_data/species.rs b/src/static_data/species_data/species.rs
index 3a7c935..18352d3 100755
--- a/src/static_data/species_data/species.rs
+++ b/src/static_data/species_data/species.rs
@@ -1,3 +1,4 @@
+use std::fmt::Debug;
 use std::sync::{Arc, LazyLock};
 
 use hashbrown::{HashMap, HashSet};
@@ -9,9 +10,38 @@ use crate::static_data::Gender;
 use crate::StringKey;
 use crate::{Random, ValueIdentifiable, ValueIdentifier};
 
+/// The data belonging to a Pokemon with certain characteristics.
+pub trait Species: ValueIdentifiable + Debug {
+    /// The national dex identifier of the Pokemon.
+    fn id(&self) -> u16;
+    /// The name of the Pokemon.
+    fn name(&self) -> &StringKey;
+    /// The chance between 0.0 and 1.0 that a Pokemon is female.
+    fn gender_rate(&self) -> f32;
+    /// How much experience is required for a level.
+    fn growth_rate(&self) -> &StringKey;
+    /// How hard it is to capture a Pokemon. 255 means this will be always caught, 0 means this is
+    /// uncatchable.
+    fn capture_rate(&self) -> u8;
+    /// The forms that belong to this Pokemon.
+    fn forms(&self) -> RwLockReadGuard<'_, RawRwLock, HashMap<StringKey, Arc<dyn Form>>>;
+    /// The arbitrary flags that can be set on a Pokemon for script use.
+    fn flags(&self) -> &HashSet<StringKey>;
+    /// Adds a new form to the species.
+    fn add_form(&self, id: StringKey, form: Arc<dyn Form>);
+    /// Gets a form by name.
+    fn get_form(&self, id: &StringKey) -> Option<Arc<dyn Form>>;
+    /// Gets the form the Pokemon will have by default, if no other form is specified.
+    fn get_default_form(&self) -> Arc<dyn Form>;
+    /// Gets a random gender.
+    fn get_random_gender(&self, rand: &mut Random) -> Gender;
+    /// Check whether the Pokemon has a specific flag set.
+    fn has_flag(&self, key: &StringKey) -> bool;
+}
+
 /// The data belonging to a Pokemon with certain characteristics.
 #[derive(Debug)]
-pub struct Species {
+pub struct SpeciesImpl {
     /// A unique identifier so we know what value this is.
     identifier: ValueIdentifier,
     /// The national dex identifier of the Pokemon.
@@ -26,7 +56,7 @@ pub struct Species {
     /// uncatchable.
     capture_rate: u8,
     /// The forms that belong to this Pokemon.
-    forms: RwLock<HashMap<StringKey, Arc<Form>>>,
+    forms: RwLock<HashMap<StringKey, Arc<dyn Form>>>,
     /// The arbitrary flags that can be set on a Pokemon for script use.
     flags: HashSet<StringKey>,
 }
@@ -39,7 +69,7 @@ fn get_default_key() -> StringKey {
     DEFAULT_KEY.clone()
 }
 
-impl Species {
+impl SpeciesImpl {
     /// Creates a new species.
     pub fn new(
         id: u16,
@@ -47,12 +77,12 @@ impl Species {
         gender_rate: f32,
         growth_rate: &StringKey,
         capture_rate: u8,
-        default_form: Arc<Form>,
+        default_form: Arc<dyn Form>,
         flags: HashSet<StringKey>,
-    ) -> Species {
+    ) -> Self {
         let mut forms = HashMap::with_capacity(1);
         forms.insert_unique_unchecked(get_default_key(), default_form);
-        Species {
+        Self {
             identifier: Default::default(),
             id,
             name: name.clone(),
@@ -63,54 +93,56 @@ impl Species {
             flags,
         }
     }
+}
 
+impl Species for SpeciesImpl {
     /// The national dex identifier of the Pokemon.
-    pub fn id(&self) -> u16 {
+    fn id(&self) -> u16 {
         self.id
     }
     /// The name of the Pokemon.
-    pub fn name(&self) -> &StringKey {
+    fn name(&self) -> &StringKey {
         &self.name
     }
     /// The chance between 0.0 and 1.0 that a Pokemon is female.
-    pub fn gender_rate(&self) -> f32 {
+    fn gender_rate(&self) -> f32 {
         self.gender_rate
     }
     /// How much experience is required for a level.
-    pub fn growth_rate(&self) -> &StringKey {
+    fn growth_rate(&self) -> &StringKey {
         &self.growth_rate
     }
     /// How hard it is to capture a Pokemon. 255 means this will be always caught, 0 means this is
     /// uncatchable.
-    pub fn capture_rate(&self) -> u8 {
+    fn capture_rate(&self) -> u8 {
         self.capture_rate
     }
     /// The forms that belong to this Pokemon.
-    pub fn forms(&self) -> RwLockReadGuard<'_, RawRwLock, HashMap<StringKey, Arc<Form>>> {
+    fn forms(&self) -> RwLockReadGuard<'_, RawRwLock, HashMap<StringKey, Arc<dyn Form>>> {
         self.forms.read()
     }
     /// The arbitrary flags that can be set on a Pokemon for script use.
-    pub fn flags(&self) -> &HashSet<StringKey> {
+    fn flags(&self) -> &HashSet<StringKey> {
         &self.flags
     }
 
     /// Adds a new form to the species.
-    pub fn add_form(&self, id: StringKey, form: Arc<Form>) {
+    fn add_form(&self, id: StringKey, form: Arc<dyn Form>) {
         self.forms.write().insert(id, form);
     }
 
     /// Gets a form by name.
-    pub fn get_form(&self, id: &StringKey) -> Option<Arc<Form>> {
+    fn get_form(&self, id: &StringKey) -> Option<Arc<dyn Form>> {
         self.forms.read().get(id).cloned()
     }
 
     /// Gets the form the Pokemon will have by default, if no other form is specified.
-    pub fn get_default_form(&self) -> Arc<Form> {
+    fn get_default_form(&self) -> Arc<dyn Form> {
         self.forms.read().get(&get_default_key()).unwrap().clone()
     }
 
     /// Gets a random gender.
-    pub fn get_random_gender(&self, rand: &mut Random) -> Gender {
+    fn get_random_gender(&self, rand: &mut Random) -> Gender {
         if self.gender_rate < 0.0 {
             Gender::Genderless
         } else if rand.get_float() >= self.gender_rate {
@@ -121,13 +153,42 @@ impl Species {
     }
 
     /// Check whether the Pokemon has a specific flag set.
-    pub fn has_flag(&self, key: &StringKey) -> bool {
+    fn has_flag(&self, key: &StringKey) -> bool {
         self.flags.contains(key)
     }
 }
 
-impl ValueIdentifiable for Species {
+impl ValueIdentifiable for SpeciesImpl {
     fn value_identifier(&self) -> ValueIdentifier {
         self.identifier
     }
 }
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+
+    mockall::mock! {
+        #[derive(Debug)]
+        pub Species {}
+        impl Species for Species {
+            fn id(&self) -> u16;
+            fn name(&self) -> &StringKey;
+            fn gender_rate(&self) -> f32;
+            fn growth_rate(&self) -> &StringKey;
+            fn capture_rate(&self) -> u8;
+            fn forms(&self) -> RwLockReadGuard<'_, RawRwLock, HashMap<StringKey, Arc<dyn Form>>>;
+            fn flags(&self) -> &HashSet<StringKey>;
+            fn add_form(&self, id: StringKey, form: Arc<dyn Form>);
+            fn get_form(&self, id: &StringKey) -> Option<Arc<dyn Form>>;
+            fn get_default_form(&self) -> Arc<dyn Form>;
+            fn get_random_gender(&self, rand: &mut Random) -> Gender;
+            fn has_flag(&self, key: &StringKey) -> bool;
+        }
+        impl ValueIdentifiable for Species {
+            fn value_identifier(&self) -> ValueIdentifier {
+                ValueIdentifier::new(0)
+            }
+        }
+    }
+}
diff --git a/tests/common/library_loader.rs b/tests/common/library_loader.rs
index 75d58b3..b6419a3 100755
--- a/tests/common/library_loader.rs
+++ b/tests/common/library_loader.rs
@@ -16,10 +16,10 @@ use pkmn_lib::dynamic_data::Gen7DamageLibrary;
 use pkmn_lib::dynamic_data::Gen7MiscLibrary;
 use pkmn_lib::script_implementations::wasm::script_resolver::WebAssemblyScriptResolver;
 use pkmn_lib::static_data::{
-    AbilityImpl, AbilityLibrary, BattleItemCategory, DataLibrary, EffectParameter, Form, GrowthRateLibrary, ItemImpl,
-    ItemLibrary, LearnableMoves, LearnableMovesImpl, LibrarySettings, LookupGrowthRate, MoveDataImpl, MoveLibrary,
-    NatureImpl, NatureLibrary, SecondaryEffect, SecondaryEffectImpl, Species, StaticData, StaticStatisticSet,
-    Statistic, TypeLibrary,
+    AbilityImpl, AbilityLibrary, BattleItemCategory, DataLibrary, EffectParameter, Form, FormImpl, GrowthRateLibrary,
+    ItemImpl, ItemLibrary, LearnableMoves, LearnableMovesImpl, LibrarySettings, LookupGrowthRate, MoveDataImpl,
+    MoveLibrary, NatureImpl, NatureLibrary, SecondaryEffect, SecondaryEffectImpl, SpeciesImpl, StaticData,
+    StaticStatisticSet, Statistic, TypeLibrary,
 };
 use pkmn_lib::StringKey;
 
@@ -263,7 +263,7 @@ pub fn load_species(path: &String, library: &mut StaticData) {
         let default_form_value = forms.get("default").unwrap();
         let default_form = parse_form("default".into(), default_form_value, library);
 
-        let species = Species::new(
+        let species = SpeciesImpl::new(
             id as u16,
             &name,
             gender_rate as f32,
@@ -285,7 +285,7 @@ fn load_wasm(path: &String, library: &mut WebAssemblyScriptResolver) {
     library.finalize();
 }
 
-fn parse_form(name: StringKey, value: &Value, library: &mut StaticData) -> Arc<Form> {
+fn parse_form(name: StringKey, value: &Value, library: &mut StaticData) -> Arc<dyn Form> {
     let mut abilities = Vec::new();
     for a in value.get("abilities").unwrap().as_array().unwrap() {
         abilities.push(a.as_str().unwrap().into());
@@ -310,7 +310,7 @@ fn parse_form(name: StringKey, value: &Value, library: &mut StaticData) -> Arc<F
 
     let moves = parse_moves(value.get("moves").unwrap(), library.moves());
 
-    Arc::new(Form::new(
+    Arc::new(FormImpl::new(
         &name,
         height as f32,
         weight as f32,