Whenever 1 of your Dark Pokémon does any damage to a Pokémon with an attack, flip a coin. If heads, flip another coin. If the second coin is heads, that attack does 20 more damage. If the second coin is tails, that attack does 10 more damage. You can only have one Dark Wave active. This power stops working if Great Rocket's Mewtwo is Asleep, Confused or Paralyzed.
Flip the number of coins equal to the number of Dark Pokémon on your bench. This attach does 20 damage plus 20 more damage for each head.s