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I find it hilarious to bring a Zoroark on cart, since they know you have it. But never actually bring it into battle, everyone will always just assume you're using it so there's almost always a fighting/fairy move at one of the pokemon at the start. Which is fun when I bring in the chonky boy.
It's the same thing as having Tatsugiri+Dondozo on your team, even if you literally never bring them. You can almost ensure a Murkrow/Amoonguss on their team that way.