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.
You can only have 1 Prism Star Card of the same name per Deck
Once during your turn (before your attack), you may put any Stage 1 card from your hand onto this Pokémon to evolve it. You can't use this Ability during your first turn ot the turn this Pokémon was put into play.