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The thing is, we haven't really seen Leon fight any battles that weren't 1v1 yet, and the only team members we've seen are his Charizard and Dragapult.
That said, the new trailer pretty much confirmed that he also has a Gigantamax Rillaboom (Goh's Grookey isn't evolving, and Hop isn't in the tournament), and that Mega Charizard Y that keeps showing up in merch might also be his, to show that he has options besides Charizard and doesn't always rely on Gigantamax.
