Jolteon ex

Poke-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.

Second Bite (20+): Does 20 damage plus 10 more damage for each damage counter on the Defending Pokémon.

Thunder Blast (70): Discard a Lightning Energy card attached to Jolteon ex.