Last couple abilities

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

@@ -0,0 +1,20 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// White Smoke is an ability that prevents the Pokémon's stats from being lowered by other Pokémon.
+///
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/White_Smoke_(Ability)">Bulbapedia - White Smoke</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "white_smoke")]
+public class WhiteSmoke : Script
+{
+    /// <inheritdoc />
+    public override void PreventStatBoostChange(IPokemon target, Statistic stat, sbyte amount, bool selfInflicted,
+        ref bool prevent)
+    {
+        if (selfInflicted || amount >= 0)
+            return;
+
+        prevent = true;
+    }
+}