Darkrai 4

You may have your opponent switch the Defending Pokémon with 1 or his or her Benched Pokémon. Damage: 10

If the Defending Pokémon is Asleep, this attack does 40 damage plus 40 more damage. If the Defending Pokémon is not Asleep, that Pokémon is now Asleep. Damage: 40+