Adds a bunch of helpers for evolution, as well as custom script evolution methods.

src/Battling/EvolutionScript.hpp

@@ -0,0 +1,13 @@
+#ifndef PKMNLIB_EVOLUTIONSCRIPT_HPP
+#define PKMNLIB_EVOLUTIONSCRIPT_HPP
+
+namespace PkmnLib::Battling {
+    class EvolutionScript {
+    public:
+        virtual void DoesEvolveFromLevelUp(const ArbUt::BorrowedPtr<const PkmnLib::Library::EvolutionData>& evolution,
+                                           const ArbUt::BorrowedPtr<const PkmnLib::Battling::Pokemon>& pokemon,
+                                           bool* out) const = 0;
+    };
+}
+
+#endif // PKMNLIB_EVOLUTIONSCRIPT_HPP

src/Battling/Library/MiscLibrary.cpp

@@ -66,7 +66,16 @@ bool PkmnLib::Battling::MiscLibrary::CanEvolveFromLevelUp(
             return pokemon->GetLevel() >= evolution->GetData(1)->AsInt() &&
                    pokemon->GetGender() == (CreatureLib::Library::Gender)evolution->GetData(0)->AsInt();
         case Library::EvolutionMethod::Custom:
-            // TODO
+        {
+            auto script = dynamic_cast<ScriptResolver*>(pokemon->GetLibrary()->GetScriptResolver().get())
+                ->LoadEvolutionScript(evolution->GetData(0)->AsString());
+            if (!script.HasValue()) {
+                return false;
+            }
+            auto v = false;
+            script.GetValue()->DoesEvolveFromLevelUp(evolution, pokemon, &v);
+            return v;
+        }
         case Library::EvolutionMethod::EvolutionItemUse:
         case Library::EvolutionMethod::EvolutionItemUseWithGender:
         case Library::EvolutionMethod::Trade:

src/Battling/Library/ScriptResolver.hpp

@@ -1,9 +1,14 @@
 #ifndef PKMNLIB_SCRIPTRESOLVER_HPP
 #define PKMNLIB_SCRIPTRESOLVER_HPP
 
+#include "../EvolutionScript.hpp"
+
 namespace PkmnLib::Battling {
     class ScriptResolver : public CreatureLib::Battling::ScriptResolver {
     public:
+        virtual ArbUt::OptionalBorrowedPtr<const EvolutionScript> LoadEvolutionScript(const ArbUt::StringView&) {
+            return nullptr;
+        };
     };
 }