Adds more abilities

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

@@ -0,0 +1,20 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// Defeatist is an ability that halves the Pokémon's Attack and Special Attack when its HP drops below 50%.
+/// This reduction applies to all moves used by the Pokémon, making it significantly weaker when damaged.
+/// 
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/Defeatist_(Ability)">Bulbapedia - Defeatist</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "defeatist")]
+public class Defeatist : Script
+{
+    /// <inheritdoc />
+    public override void ChangeDamageModifier(IExecutingMove move, IPokemon target, byte hit, ref float modifier)
+    {
+        if (move.User.CurrentHealth < move.User.MaxHealth / 2)
+        {
+            modifier *= 0.5f;
+        }
+    }
+}