You can't have more than 1 cards with the same name in your deck. If a card would go in the discard pile, put it in the Lost Zone instead.
Volcanion
160 HP
You can only have 1 Prism Star Card of the same name per Deck
Jet Geyser
Once during your turn (before your attack), you may discard a Energy card from your hand. If you do, your opponent switches their Active Pokémon with 1 of their benched Pokémon.
Sauna Blast
This attack does 20 damage to each of your opponent's Benched Pokémon (Don't apply Weakness and Resistance for Benched Pokémon)