You can’t have more than 1 Pokémon in you deck.
Once during your turn, when you put Umbreon from your hand onto your Bench, you may choose 1 card from your opponent’s hand without looking and discard it.
Choose 1 of your opponent’s Pokémon. This attack does 30 damage to that Pokémon. This attack’s damage isn’t affected by Weakness, Resistance, Poké-Powers, Poké-Bodies, or any other effects on that Pokémon.
POP Series 5