Move all battle state from IPokemon to an ephemeral IBattlePokemon wrapper

Plugins/PkmnLib.Plugin.Gen7/Scripts/Pokemon/WishEffect.cs

@@ -3,13 +3,13 @@ namespace PkmnLib.Plugin.Gen7.Scripts.Pokemon;
 [Script(ScriptCategory.Pokemon, "wish")]
 public class WishEffect : Script, IScriptOnEndTurn
 {
-    private IPokemon? _pokemon;
+    private IBattlePokemon? _pokemon;
     private bool _hasDoneFirstTurn;
 
     /// <inheritdoc />
     public override void OnAddedToParent(IScriptSource source)
     {
-        if (source is not IPokemon pokemon)
+        if (source is not IBattlePokemon pokemon)
         {
             throw new InvalidOperationException("Wish script can only be added to a Pokemon.");
         }
@@ -27,7 +27,7 @@ public class WishEffect : Script, IScriptOnEndTurn
             return;
         }
 
-        if (_pokemon.BattleData?.IsOnBattlefield == true)
+        if (_pokemon.IsOnBattlefield == true)
         {
             _pokemon.Heal(_pokemon.MaxHealth / 2);
         }