There are multiple reasons to do so: re-using when you play this Pokmon on your Bench Abilities, healing a damaged Pokmon, saving an easy target (like Lumineon V) from a potential KO, or just managing Bench space
The new Pokemon Trading Card Game expansion is a big one
All the mechanics done, lets get onto the cards
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SYSTEM REQUIREMENTS With over 6,600 cards to play with, including new Pendulum Summon Monsters, Duelists can fight in hundreds of matches with over 90 characters, and even compete in new Battle Pack Sealed Deck and Draft play with other Duelists online
Read the original article from The Pokmon Company.