Nidoking

Once during your turn (before your attack), if Nidoking is your Active Pokémon, you may flip a coin. If heads, put a damage counter on each of your opponent's Benched Pokémon. This power can't be used if Nidoking is affected by a Special Condition.

Flip a coin. If heads, this attack does 50 damage plus 30 more damage.