Darkrai MD 3

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.

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

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