diff --git a/src/ffi/dynamic_data/libraries/battle_stat_calculator.rs b/src/ffi/dynamic_data/libraries/battle_stat_calculator.rs
index 6f2401e..469ca27 100644
--- a/src/ffi/dynamic_data/libraries/battle_stat_calculator.rs
+++ b/src/ffi/dynamic_data/libraries/battle_stat_calculator.rs
@@ -1,5 +1,6 @@
 use crate::dynamic_data::{BattleStatCalculator, Gen7BattleStatCalculator};
-use crate::ffi::IdentifiablePointer;
+use crate::ffi::{IdentifiablePointer, OwnedPtr};
+use std::ptr::drop_in_place;
 
 /// Creates a new Gen 7 battle stat calculator
 #[no_mangle]
@@ -9,3 +10,9 @@ extern "C" fn gen_7_battle_stat_calculator_new() -> IdentifiablePointer<Box<dyn
     let ptr = Box::into_raw(Box::new(v));
     IdentifiablePointer::new(ptr, id)
 }
+
+/// Drops a battle stat calculator.
+#[no_mangle]
+extern "C" fn battle_stat_calculator_drop(ptr: OwnedPtr<Box<dyn BattleStatCalculator>>) {
+    unsafe { drop_in_place(ptr) };
+}
diff --git a/src/ffi/dynamic_data/libraries/damage_library.rs b/src/ffi/dynamic_data/libraries/damage_library.rs
index 35e462e..592e80c 100644
--- a/src/ffi/dynamic_data/libraries/damage_library.rs
+++ b/src/ffi/dynamic_data/libraries/damage_library.rs
@@ -1,5 +1,6 @@
 use crate::dynamic_data::{DamageLibrary, Gen7DamageLibrary};
-use crate::ffi::IdentifiablePointer;
+use crate::ffi::{IdentifiablePointer, OwnedPtr};
+use std::ptr::drop_in_place;
 
 /// Creates a new generation 7 damage library. `has_randomness` defines whether a random damage
 /// modifier (0.85x - 1.00x) is applied to the calculated damage.
@@ -10,3 +11,9 @@ extern "C" fn gen_7_damage_library_new(randomness: u8) -> IdentifiablePointer<Bo
     let ptr = Box::into_raw(Box::new(v));
     IdentifiablePointer::new(ptr, id)
 }
+
+/// Drops a DamageLibrary.
+#[no_mangle]
+extern "C" fn damage_library_drop(ptr: OwnedPtr<Box<dyn DamageLibrary>>) {
+    unsafe { drop_in_place(ptr) };
+}
diff --git a/src/ffi/dynamic_data/libraries/dynamic_library.rs b/src/ffi/dynamic_data/libraries/dynamic_library.rs
index aeab133..cd5c231 100644
--- a/src/ffi/dynamic_data/libraries/dynamic_library.rs
+++ b/src/ffi/dynamic_data/libraries/dynamic_library.rs
@@ -3,6 +3,7 @@ use crate::dynamic_data::{
 };
 use crate::ffi::{IdentifiablePointer, OwnedPtr};
 use crate::static_data::StaticData;
+use std::ptr::drop_in_place;
 use std::sync::Arc;
 
 /// Instantiates a new DynamicLibrary with given parameters.
@@ -25,3 +26,9 @@ extern "C" fn dynamic_library_new(
         a.into()
     }
 }
+
+/// Drops a dynamic library.
+#[no_mangle]
+extern "C" fn dynamic_library_drop(ptr: OwnedPtr<Arc<dyn StaticData>>) {
+    unsafe { drop_in_place(ptr) };
+}
diff --git a/src/ffi/dynamic_data/libraries/misc_library.rs b/src/ffi/dynamic_data/libraries/misc_library.rs
index 25a875d..c339e6a 100644
--- a/src/ffi/dynamic_data/libraries/misc_library.rs
+++ b/src/ffi/dynamic_data/libraries/misc_library.rs
@@ -1,5 +1,6 @@
 use crate::dynamic_data::{Gen7MiscLibrary, MiscLibrary};
-use crate::ffi::IdentifiablePointer;
+use crate::ffi::{IdentifiablePointer, OwnedPtr};
+use std::ptr::drop_in_place;
 
 /// Instantiates a new MiscLibrary.
 #[no_mangle]
@@ -9,3 +10,9 @@ extern "C" fn gen_7_misc_library_new() -> IdentifiablePointer<Box<dyn MiscLibrar
     let ptr = Box::into_raw(Box::new(v));
     IdentifiablePointer::new(ptr, id)
 }
+
+/// Drops a MiscLibrary.
+#[no_mangle]
+extern "C" fn misc_library_drop(ptr: OwnedPtr<Box<dyn MiscLibrary>>) {
+    unsafe { drop_in_place(ptr) };
+}
diff --git a/src/ffi/dynamic_data/libraries/script_resolver.rs b/src/ffi/dynamic_data/libraries/script_resolver.rs
index 75966ae..b40968b 100644
--- a/src/ffi/dynamic_data/libraries/script_resolver.rs
+++ b/src/ffi/dynamic_data/libraries/script_resolver.rs
@@ -1,5 +1,6 @@
 use crate::dynamic_data::{EmptyScriptResolver, ScriptResolver};
-use crate::ffi::IdentifiablePointer;
+use crate::ffi::{IdentifiablePointer, OwnedPtr};
+use std::ptr::drop_in_place;
 
 /// Instantiates a basic empty script resolver, that always returns None.
 #[no_mangle]
@@ -12,6 +13,12 @@ extern "C" fn empty_script_resolver_new() -> IdentifiablePointer<Box<dyn ScriptR
     IdentifiablePointer::new(ptr, id)
 }
 
+/// Drops a script resolver.
+#[no_mangle]
+extern "C" fn script_resolver_drop(ptr: OwnedPtr<Box<dyn ScriptResolver>>) {
+    unsafe { drop_in_place(ptr) };
+}
+
 /// Foreign function interfaces for the Webassembly script resolver.
 #[cfg(feature = "wasm")]
 mod web_assembly_script_resolver {
diff --git a/src/ffi/dynamic_data/models/pokemon.rs b/src/ffi/dynamic_data/models/pokemon.rs
index 6d9ad2b..e005623 100644
--- a/src/ffi/dynamic_data/models/pokemon.rs
+++ b/src/ffi/dynamic_data/models/pokemon.rs
@@ -14,7 +14,7 @@ extern "C" fn pokemon_new(
     library: ExternPointer<Arc<dyn DynamicLibrary>>,
     species: ExternPointer<Arc<dyn Species>>,
     form: ExternPointer<Arc<dyn Form>>,
-    hidden_ability: bool,
+    hidden_ability: u8,
     ability_index: u8,
     level: LevelInt,
     unique_identifier: u32,
@@ -28,7 +28,7 @@ extern "C" fn pokemon_new(
         species.as_ref().clone(),
         form.as_ref(),
         AbilityIndex {
-            hidden: hidden_ability,
+            hidden: hidden_ability == 1,
             index: ability_index,
         },
         level,
@@ -246,7 +246,7 @@ extern "C" fn pokemon_get_battle_side_index(ptr: ExternPointer<Arc<Pokemon>>) ->
 }
 
 /// Get the index of the slot on the side of the battle the Pokemon is in. If the Pokemon
-// is not on the battlefield, this always returns 0.
+/// is not on the battlefield, this always returns 0.
 #[no_mangle]
 extern "C" fn pokemon_get_battle_index(ptr: ExternPointer<Arc<Pokemon>>) -> u8 {
     ptr.as_ref().get_battle_index().unwrap_or_default()