Even more abilities

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

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+using PkmnLib.Plugin.Gen7.Scripts.Pokemon;
+
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+/// <summary>
+/// Slow Start is an ability that halves the user's Attack and Speed for five turns after entering battle.
+///
+/// <see href="https://bulbapedia.bulbagarden.net/wiki/Slow_Start_(Ability)">Bulbapedia - Slow Start</see>
+/// </summary>
+[Script(ScriptCategory.Ability, "slow_start")]
+public class SlowStart : Script
+{
+    private IPokemon? _pokemon;
+
+    /// <inheritdoc />
+    public override void OnSwitchIn(IPokemon pokemon, byte position)
+    {
+        _pokemon = pokemon;
+        pokemon.Volatile.Add(new SlowStartEffect());
+    }
+
+    /// <inheritdoc />
+    public override void OnRemove()
+    {
+        _pokemon?.Volatile.Remove<SlowStartEffect>();
+    }
+}