More tests, more fixes

PkmnLib.Dynamic/Models/Pokemon.cs

@@ -296,7 +296,7 @@ public interface IPokemon : IScriptSource, IDeepCloneable
     /// <summary>
     /// Suppresses the ability of the Pokémon.
     /// </summary>
-    void SuppressAbility();
+    bool SuppressAbility();
 
     /// <summary>
     /// Returns the currently active ability.
@@ -974,10 +974,14 @@ public class PokemonImpl : ScriptSource, IPokemon
     public bool AbilitySuppressed { get; private set; }
 
     /// <inheritdoc />
-    public void SuppressAbility()
+    public bool SuppressAbility()
     {
+        if (ActiveAbility?.CanBeChanged == false)
+            return false;
+
         AbilitySuppressed = true;
         AbilityScript.Clear();
+        return true;
     }
 
     private (IAbility, AbilityIndex)? _abilityCache;