More abilities, implemented support for form inheritance

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

@@ -0,0 +1,19 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// Multiscale is an ability that reduces damage taken when at full HP.
+///
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/Multiscale_(Ability)">Bulbapedia - Multiscale</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "multiscale")]
+public class Multiscale : Script
+{
+    /// <inheritdoc />
+    public override void ChangeIncomingMoveDamage(IExecutingMove move, IPokemon target, byte hit, ref uint damage)
+    {
+        if (target.CurrentHealth == target.BoostedStats.Hp)
+        {
+            damage = (uint)(damage * 0.5);
+        }
+    }
+}