Mew ex

Poke-POWER — Psychic Vision: Once during your turn (before your attack), if Mew ex is on your Bench, you may look at your opponent's hand.

Super Psy Bolt (30)

Devo Crush (50): You may discard 2 Energy attached to Mew ex. If you do, you may remove the highest Stage Evolution card from the Defending Pokémon and shuffle that card into your opponent's deck.