Darkrai

Once during your turn, when you put Darkrai from your hand onto your Bench, you may choose 1 of the Defending Pokémon. That Pokémon is now Asleep.

Dark Slumber

10

At the end of your opponent's next turn, the Defending Pokémon is now Asleep.

Dark Resolve

40

If the Defending Pokémon is Asleep, remove 4 damage counters from Darkrai.