More abilities

Plugins/PkmnLib.Plugin.Gen7/Scripts/Abilities/FriendGuard.cs

@@ -0,0 +1,34 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// Friend Guard is an ability that reduces the damage taken by allies by 25%.
+/// This ability is commonly associated with Clefairy and Vivillon.
+///
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/Friend_Guard_(Ability)">Bulbapedia - Friend Guard</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "friend_guard")]
+public class FriendGuard : Script
+{
+    private IPokemon? _pokemon;
+
+    /// <inheritdoc />
+    public override void OnAddedToParent(IScriptSource source)
+    {
+        if (source is not IPokemon pokemon)
+            throw new InvalidOperationException("Friend Guard can only be added to a Pokemon script source.");
+        _pokemon = pokemon;
+        var effect = _pokemon.BattleData?.BattleSide.VolatileScripts.Add(new Side.FriendGuardEffect());
+        (effect?.Script as Side.FriendGuardEffect)?.OnAdded(_pokemon);
+    }
+
+    /// <inheritdoc />
+    public override void OnRemove()
+    {
+        if (_pokemon is null)
+            return;
+        if (_pokemon.BattleData?.BattleSide.VolatileScripts.TryGet<Side.FriendGuardEffect>(out var script) == true)
+        {
+            script.OnRemoved(_pokemon);
+        }
+    }
+}