Last couple abilities

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

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+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// Zen Mode is an ability that changes the Pokémon's form when its HP falls below half.
+///
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/Zen_Mode_(Ability)">Bulbapedia - Zen Mode</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "zen_mode")]
+public class ZenMode : Script
+{
+    /// <inheritdoc />
+    public override void OnSwitchIn(IPokemon pokemon, byte position) => ChangeFormIfNeeded(pokemon);
+
+    /// <inheritdoc />
+    public override void OnEndTurn(IScriptSource owner, IBattle battle) => ChangeFormIfNeeded(owner as IPokemon);
+
+    private static void ChangeFormIfNeeded(IPokemon? pokemon)
+    {
+        if (pokemon is null)
+            return;
+
+        if (pokemon.Species.Name != "darmanitan" || pokemon.BattleData?.Battle == null)
+            return;
+        if (pokemon.CurrentHealth < pokemon.MaxHealth / 2 && pokemon.Form.Name != "zen" &&
+            pokemon.Species.TryGetForm("zen", out var zenForm))
+        {
+            pokemon.ChangeForm(zenForm);
+        }
+        else if (pokemon.CurrentHealth >= pokemon.MaxHealth / 2 && pokemon.Form.Name == "zen")
+        {
+            pokemon.ChangeForm(pokemon.Species.GetDefaultForm());
+        }
+    }
+}