As long as Snorlax remains Asleep between turns, put 2 damage counters on the Defending Pokémon.

Once during your turn (before your attack), if Snorlax is your Active Pokémon, you may remove 2 damage counters from Snorlax and Snorlax is now Asleep. This power can't be used if Snorlax is affected by a Special Condition.