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>Circle evolves into Oval, which evolves into Cylinder, They're fast physycal sweepers with rock head, making them good with moves such as double edge or flare blitz, however will pretty much crumple when hit with anything it doesn't resist
>Triangle evolves into Pentagon, which evolves into Octagon, Very solid support moveset and speed, but unable to do much outside of support with pitiful attacking stats, decent defensive stats tho.
>square evolves into rectangle, which evolves into , Very solid bulk and a half-decent attack, plus having recover in it's moveset is always a plus, however, poor speed leaves it at the mercy of faster threats that can cripple it.
Overall, I'd have to go with circle, I've always been a fan of the glass cannon