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I'd catch Groudon by bringing a bunch of water Pokemon like Clauncher, Blastoise, Feraligatr, Octillery, Pelipper, and Kingdra, and just hose the fucker down until he's weak enough to catch
Groudon is only 11 feet tall, can't be that hard, all he does is generate heat to dry up oceans. all I have to do is hose him down until he cools off. given just how much heat he can Generate it'll take a lot of concentrated water blasting to cool him off. but it seems possible