Implements more abilities

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

@@ -0,0 +1,27 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// Delta Stream is an ability that creates strong winds when the Pokémon enters battle.
+/// These winds weaken the power of super-effective Flying-type moves and prevent other weather conditions.
+/// This ability is exclusive to Mega Rayquaza.
+///
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/Delta_Stream_(Ability)">Bulbapedia - Delta Stream</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "delta_stream")]
+public class DeltaStreamAbility : Script
+{
+    /// <inheritdoc />
+    public override void OnSwitchIn(IPokemon pokemon, byte position)
+    {
+        var battle = pokemon.BattleData?.Battle;
+        if (battle == null)
+            return;
+
+        battle.SetWeather(ScriptUtils.ResolveName<Weather.StrongWinds>(), -1);
+        if (battle.WeatherName == ScriptUtils.ResolveName<Weather.StrongWinds>())
+        {
+            ((Weather.StrongWinds)battle.WeatherScript.Script!).MarkAsPlaced(pokemon);
+            battle.EventHook.Invoke(new AbilityTriggerEvent(pokemon));
+        }
+    }
+}