Hypno HGSS 23

Once during your turn (before your attack), you may flip a coin. If heads, the Defending Pokémon is now Asleep. This power can't be used if Hypno is affected by a Special Condition.

Does 10 damage to 1 of your opponent's Benched Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)