Unown [Q].

Poké-PowerQUICK

Once during your turn (before your attack), if Unown Q is on your Bench, you may discard all cards attached to Unown Q and attach Unown Q to 1 of your Pokémon as a Pokémon Tool card. As long as Unown Q is attached to a Pokémon, you pay Colorless less to retreat that Pokémon.