You can play only one Supporter card each turn. When you play this card, put it next to your Active Pokémon. When your turn ends, discard this card.
Choose 1 Legendary Pokémon (Articuno, Zapdos, Moltres, Lugia, or Ho-Oh) your opponent has in play. Discard all cards attached to that Pokémon and put it on your Bench. From now on, treat that Pokémon as if it were your own Pokémon.