First couple abilities implemented

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

@@ -0,0 +1,39 @@
+using PkmnLib.Static.Utils;
+
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+[Script(ScriptCategory.Ability, "anticipation")]
+public class Anticipation : Script
+{
+    private IPokemon? _owner;
+
+    /// <inheritdoc />
+    public override void OnAddedToParent(IScriptSource source)
+    {
+        if (source is not IPokemon pokemon)
+            throw new ArgumentException("Anticipation script can only be added to a Pokemon.", nameof(source));
+        _owner = pokemon;
+    }
+
+    /// <inheritdoc />
+    public override void OnOpponentSwitchIn(IPokemon pokemon, byte position)
+    {
+        if (_owner is null)
+            return;
+        var pokemonMoves = pokemon.Moves.WhereNotNull();
+        var typeLibrary = pokemon.Library.StaticLibrary.Types;
+        var relevantMoves = pokemonMoves.Any(move =>
+            // Either the move is super effective against the owner or
+            typeLibrary.GetEffectiveness(move.MoveData.MoveType, _owner.Types) > 1.0f ||
+            // the move is a OHKO move
+            move.MoveData.SecondaryEffect?.Name == "one_hit_ko" ||
+            // the move is a self-destruct move
+            move.MoveData.SecondaryEffect?.Name == "self_destruct" ||
+            move.MoveData.SecondaryEffect?.Name == "explosion");
+
+        if (relevantMoves)
+        {
+            pokemon.BattleData?.Battle.EventHook.Invoke(new AbilityTriggerEvent(_owner));
+        }
+    }
+}