diff --git a/CInterface/Battling/Pokemon.cpp b/CInterface/Battling/Pokemon.cpp
index 36eb848..1f9fd73 100644
--- a/CInterface/Battling/Pokemon.cpp
+++ b/CInterface/Battling/Pokemon.cpp
@@ -2,13 +2,15 @@
 #include "../Core.hpp"
 using namespace PkmnLib::Battling;
 
-export uint8_t PkmnLib_Pokemon_Construct(
-    Pokemon*& out, const BattleLibrary* library, const PkmnLib::Library::PokemonSpecies* species,
-    const PkmnLib::Library::PokemonForme* forme, uint8_t level, uint32_t experience, uint32_t uid,
-    CreatureLib::Library::Gender gender, uint8_t coloring, const PkmnLib::Library::Item* heldItem, const char* nickname,
-    bool hiddenAbility, uint8_t abilityIndex, CreatureLib::Battling::LearnedAttack* const* moves, size_t moveCount,
-    uint8_t hpIv, uint8_t attIv, uint8_t defIv, uint8_t sAtIv, uint8_t sDeIv, uint8_t spIv, uint8_t hpEv, uint8_t attEv,
-    uint8_t defEv, uint8_t sAtEv, uint8_t sDeEv, uint8_t spEv, const PkmnLib::Library::Nature* nature) {
+export uint8_t
+PkmnLib_Pokemon_Construct(Pokemon*& out, const BattleLibrary* library, const PkmnLib::Library::PokemonSpecies* species,
+                          const PkmnLib::Library::PokemonForme* forme, uint8_t level, uint32_t experience, uint32_t uid,
+                          CreatureLib::Library::Gender gender, uint8_t coloring, const PkmnLib::Library::Item* heldItem,
+                          const char* nickname, bool hiddenAbility, uint8_t abilityIndex,
+                          CreatureLib::Battling::LearnedAttack* const* moves, size_t moveCount, uint8_t hpIv,
+                          uint8_t attIv, uint8_t defIv, uint8_t sAtIv, uint8_t sDeIv, uint8_t spIv, uint8_t hpEv,
+                          uint8_t attEv, uint8_t defEv, uint8_t sAtEv, uint8_t sDeEv, uint8_t spEv,
+                          const PkmnLib::Library::Nature* nature, bool allowedExperienceGain, bool isEgg) {
     Try({
         if (nickname == nullptr) {
             nickname = "";
@@ -20,7 +22,8 @@ export uint8_t PkmnLib_Pokemon_Construct(
             library, species, forme, level, experience, uid, gender, coloring, heldItem, nick,
             CreatureLib::Library::TalentIndex(hiddenAbility, abilityIndex), cMoves,
             CreatureLib::Library::ClampedStatisticSet<uint8_t, 0, 31>(hpIv, attIv, defIv, sAtIv, sDeIv, spIv),
-            CreatureLib::Library::ClampedStatisticSet<uint8_t, 0, 252>(hpEv, attEv, defEv, sAtEv, sDeEv, spEv), nature);
+            CreatureLib::Library::ClampedStatisticSet<uint8_t, 0, 252>(hpEv, attEv, defEv, sAtEv, sDeEv, spEv), nature,
+            allowedExperienceGain, isEgg);
     })
 };
 
@@ -29,29 +32,31 @@ export void PkmnLib_Pokemon_Destruct(const Pokemon* p) { delete p; }
 SIMPLE_GET_FUNC(Pokemon, IsShiny, bool)
 SIMPLE_GET_FUNC_SMART_PTR(Pokemon, GetNature, const PkmnLib::Library::Nature*)
 
-export uint8_t PkmnLib_Pokemon_GetIndividualValue(const Pokemon* p, CreatureLib::Library::Statistic stat) {
+export u8 PkmnLib_Pokemon_GetIndividualValue(const Pokemon* p, CreatureLib::Library::Statistic stat) {
     return p->GetIndividualValue(stat);
 }
 export void PkmnLib_Pokemon_SetIndividualValue(Pokemon* p, CreatureLib::Library::Statistic stat, uint8_t value) {
     p->SetIndividualValue(stat, value);
 }
 
-export uint8_t PkmnLib_Pokemon_GetEffortValue(const Pokemon* p, CreatureLib::Library::Statistic stat) {
+export u8 PkmnLib_Pokemon_GetEffortValue(const Pokemon* p, CreatureLib::Library::Statistic stat) {
     return p->GetEffortValue(stat);
 }
 export void PkmnLib_Pokemon_SetEffortValue(Pokemon* p, CreatureLib::Library::Statistic stat, uint8_t value) {
     p->SetEffortValue(stat, value);
 }
 
-export uint8_t PkmnLib_Pokemon_SetStatus(Pokemon* p, const char* name) { Try(p->SetStatus(ArbUt::StringView(name))); };
-export uint8_t PkmnLib_Pokemon_ClearStatus(Pokemon* p) { Try(p->ClearStatus()); };
+export u8 PkmnLib_Pokemon_SetStatus(Pokemon* p, const char* name) { Try(p->SetStatus(ArbUt::StringView(name))); };
+export u8 PkmnLib_Pokemon_ClearStatus(Pokemon* p) { Try(p->ClearStatus()); };
 export const char* PkmnLib_Pokemon_GetStatusName(Pokemon* p) { return p->GetStatusName().c_str(); }
 
 SIMPLE_GET_FUNC(Pokemon, GetFriendship, uint8_t)
-export void PkmnLib_Pokemon_SetFriendship(Pokemon* p, uint8_t value) { p->SetFriendship(value); }
-export void PkmnLib_Pokemon_ChangeFriendship(Pokemon* p, int8_t amount) { p->ChangeFriendship(amount); }
+export void PkmnLib_Pokemon_SetFriendship(Pokemon* p, u8 value) { p->SetFriendship(value); }
+export void PkmnLib_Pokemon_ChangeFriendship(Pokemon* p, i8 amount) { p->ChangeFriendship(amount); }
+SIMPLE_GET_FUNC(Pokemon, IsEgg, bool)
 
-export uint8_t PkmnLib_Pokemon_Evolve(Pokemon* p, const PkmnLib::Library::PokemonSpecies* species,
+
+export u8 PkmnLib_Pokemon_Evolve(Pokemon* p, const PkmnLib::Library::PokemonSpecies* species,
                                       const PkmnLib::Library::PokemonForme* forme) {
     Try(p->Evolve(species, forme);)
 }
\ No newline at end of file
diff --git a/src/Battling/Pokemon/Pokemon.cpp b/src/Battling/Pokemon/Pokemon.cpp
index 55efc28..8d7d4f8 100644
--- a/src/Battling/Pokemon/Pokemon.cpp
+++ b/src/Battling/Pokemon/Pokemon.cpp
@@ -91,3 +91,9 @@ CreatureLib::Battling::Creature* PkmnLib::Battling::Pokemon::Clone() const {
 
     return c;
 }
+bool PkmnLib::Battling::Pokemon::IsUsable() const noexcept {
+    if (IsEgg()) {
+        return false;
+    }
+    return Creature::IsUsable();
+}
diff --git a/src/Battling/Pokemon/Pokemon.hpp b/src/Battling/Pokemon/Pokemon.hpp
index bdd0f4c..7dba165 100644
--- a/src/Battling/Pokemon/Pokemon.hpp
+++ b/src/Battling/Pokemon/Pokemon.hpp
@@ -16,6 +16,7 @@ namespace PkmnLib::Battling {
         ArbUt::BorrowedPtr<const PkmnLib::Library::Nature> _nature;
         std::unique_ptr<CreatureLib::Battling::BattleScript> _statusScript = nullptr;
         uint8_t _friendship = 0;
+        bool _isEgg;
 
     public:
         Pokemon(ArbUt::BorrowedPtr<const BattleLibrary> library,
@@ -27,14 +28,15 @@ namespace PkmnLib::Battling {
                 const std::vector<CreatureLib::Battling::LearnedAttack*>& moves,
                 CreatureLib::Library::ClampedStatisticSet<uint8_t, 0, 31> individualValues,
                 CreatureLib::Library::ClampedStatisticSet<uint8_t, 0, 252> effortValues,
-                ArbUt::BorrowedPtr<const PkmnLib::Library::Nature> nature, bool allowedExperienceGain = true)
+                ArbUt::BorrowedPtr<const PkmnLib::Library::Nature> nature, bool allowedExperienceGain = true,
+                bool isEgg = false)
             : CreatureLib::Battling::Creature(
                   library.ForceAs<const CreatureLib::Battling::BattleLibrary>(),
                   species.ForceAs<const CreatureLib::Library::CreatureSpecies>(),
                   forme.ForceAs<const CreatureLib::Library::SpeciesVariant>(), level, experience, uid, gender, coloring,
                   heldItem.ForceAs<const CreatureLib::Library::Item>(), nickname, talent, moves, allowedExperienceGain),
               _individualValues(individualValues), _effortValues(effortValues), _nature(nature),
-              _friendship(species->GetBaseHappiness()) {}
+              _friendship(species->GetBaseHappiness()), _isEgg(isEgg) {}
 
         const ArbUt::BorrowedPtr<const Library::PokemonForme> GetForme() const {
             return _variant.ForceAs<const Library::PokemonForme>();
@@ -59,6 +61,7 @@ namespace PkmnLib::Battling {
         inline void SetEffortValue(CreatureLib::Library::Statistic stat, uint8_t value) {
             return _effortValues.SetStat(stat, value);
         }
+        inline bool IsEgg() const noexcept { return _isEgg; }
 
         inline ArbUt::BorrowedPtr<const PkmnLib::Library::PokemonSpecies> GetPokemonSpecies() const noexcept {
             return _species.As<const PkmnLib::Library::PokemonSpecies>();
@@ -88,6 +91,8 @@ namespace PkmnLib::Battling {
             _friendship = newValue;
         }
 
+        bool IsUsable() const noexcept override;
+
         Creature* Clone() const override;
     };
 }