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I think Chespin will be a bipedal physical attacker. Grass + fighting or ground. Maybe rock or steel, but I doubt it.
Froakie could turn into a bulky water type, but I like those electric/water ideas. It definitely looks like there's a weather related concept behind it.
Fennekin could turn into anything at this point. I doubt they will make it fire/fighting AGAIN. Fire/ground maybe, since it's inspired by a desert fox.