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.
Diancie
120 HP
You can only have 1 Prism Star Card of the same name per Deck
Princess's Cheers
As long as this Pokémon is on the bench, your Pokémon's attacks do 20 more damage to your opponent's Active Pokémon (before applying Weakness and Resistance)
Diamond Rain
Heal 30 damage from each of your Benched Pokémon
cards with the same name in your deck. If a 
x2
