(If you're playing casually without sideboards, it's just in your collection outside the game
Thus, our English set will feature Owner's Pokemon for Misty and Team Rocket (Gen 1), Ethan (Gen 2), Steven (Gen 3), Cynthia (Gen 4), Marnie (Gen 8), and Arven (Gen 9)
Exiling a permanent and turning into an indestructible god that distributes counters and draws more cards is well, ridiculous
Its also likely your playgroup will be okay with you including them in the 99 of your deck since none of the individual cards are too overpowered
Its also funny to think that a lot of the most powerful cards in War of the Spark are actually fairly underpowered now compared to what has been printed, but thats all part of the design direction Mark Rosewater and his team chose since this set