First couple abilities implemented

PkmnLib.Dynamic/Models/Pokemon.cs

@@ -401,7 +401,7 @@ public interface IPokemon : IScriptSource, IDeepCloneable
     /// <summary>
     /// Changes the ability of the Pokémon.
     /// </summary>
-    void ChangeAbility(IAbility ability);
+    bool ChangeAbility(IAbility ability);
 
     /// <summary>
     /// Whether the Pokémon is levitating. This is used for moves like Magnet Rise, and abilities such as
@@ -1197,8 +1197,10 @@ public class PokemonImpl : ScriptSource, IPokemon
     }
 
     /// <inheritdoc />
-    public void ChangeAbility(IAbility ability)
+    public bool ChangeAbility(IAbility ability)
     {
+        if (!ability.CanBeChanged)
+            return false;
         OverrideAbility = ability;
         if (Library.ScriptResolver.TryResolve(ScriptCategory.Ability, ability.Name, ability.Parameters,
                 out var abilityScript))
@@ -1210,6 +1212,7 @@ public class PokemonImpl : ScriptSource, IPokemon
         {
             AbilityScript.Clear();
         }
+        return true;
     }
 
     /// <inheritdoc />