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I think I took this before the gym leader and Eternatus fights so everyone is a couple levels higher now, but I'm just about to battle Leon. I like how they gave some sneaky abilities to some of the gym leader pokemon, like sap sipper on Goodra (Admittedly, I forgot Goodra was just pure Dragon and not Water/Dragon too)
I flat out stopped catching Pokemon and battling wilds after the first gym outside of like 3 to 4 instances and I was still overleveled. It's kind of annoying and probably my fault for exploring a lot of armor and getting that exp charm not knowing it was a thing.
I've legitimately never used a Hitmonchan in a playthrough, even though as a kid I played the absolute fuck out of Red and Yellow.