For more information on this Pokémon's species, see Klefki.
Klefki (Japanese: クレッフィCleffy) is a Fairy-type Basic Pokémon card. It is part of the Steam Siege expansion.
Wonder Lock ワンダーロック
Once during your turn (before your attack), if this Pokémon is on your Bench, you may discard all cards attached to this Pokémon and attach it to 1 of your Pokémon as a Pokémon Tool card. Prevent any damage done to the Pokémon this card is attached to by attacks from your opponent's Mega Evolution Pokémon. If this card is attached to a Pokémon, discard this card at the end of your opponent's turn.