When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.
Steelix ex can't be Poisoned.
Put 1 damage counter on Steelix ex.
Discard 2 Fighting Energy attached to Steelix ex and choose 1 of your opponent's Pokémon. This attack does 100 damage to that Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)