Poké-POWER Evolutionary Thunder
Once during your turn, when you play Jolteon ex from your hand to evolve 1 of your Pokémon, you may put 1 damage counter on each of your opponent's Pokémon.
Does 20 damage plus 10 more damage for each damage counter on the Defending Pokémon.
Discard a Lightning Energy card attached to Jolteon ex.
When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.