Noctowl.

Pokémon PowerGlaring Gaze

Once during your turn (before your attack), you may flip a coin. If heads, look at your opponent's hand. If your opponent has any Trainer cards there, choose 1 of them. Your opponent shuffles that card into his or her deck. This power can't be used if Noctowl is Asleep, Confused, or Paralyzed.