Text on the card
Poké-Power Devo Flash
Once during your turn, when you play Espeon ex from your hand to evolve 1 of your Pokémon, you may choose 1 Evolved Pokémon on your opponent's Bench, remove the highest Stage Evolution card from that Pokémon, and put it back into his or her hand.
Choose 1 of your opponent's Pokémon. This attack does 30 damage to that Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)
Does 60 damage plus 30 more damage for each Trainer card your opponent has in play.