Mimicry

This Pokémon's types change to match the active Terrain when this Pokémon acquires this Ability, or whenever a Terrain begins. Electric type during Electric Terrain, Grass type during Grassy Terrain, Fairy type during Misty Terrain, and Psychic type during Psychic Terrain. If this Ability is acquired without an active Terrain, or a Terrain ends, this Pokémon's types become the original types for its species.