Surprisingly, more abilities

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

@@ -0,0 +1,25 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// Snow Warning is an ability that creates hail when the Pokémon enters battle.
+///
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/Snow_Warning_(Ability)">Bulbapedia - Snow Warning</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "snow_warning")]
+public class SnowWarning : Script
+{
+    /// <inheritdoc />
+    public override void OnSwitchIn(IPokemon pokemon, byte position)
+    {
+        var battleData = pokemon.BattleData;
+        if (battleData == null)
+            return;
+
+        if (battleData.Battle.WeatherName == ScriptUtils.ResolveName<Weather.Hail>())
+            return;
+
+        EventBatchId batchId = new();
+        battleData.Battle.EventHook.Invoke(new AbilityTriggerEvent(pokemon));
+        battleData.Battle.SetWeather(ScriptUtils.ResolveName<Weather.Hail>(), 5, batchId);
+    }
+}