As long as Ampharos is in play, whenever your opponent attaches an Energy card to his or her Pokémon from his or her hand, put 1 damage counter on that Pokémon. You can't put more than 1 damage counter even if there is more than 1 Ampharos in play.
Flip a coin. If heads, this attack does 40 damage plus 40 more damage. If tails, discard 1 Energy attached to your opponent's Active Pokémon.