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Conkeldurr is better on paper, with better physical defenses and Wide Guard and Assault Vest to deal with the special defense issue. Better at sustaining itself with Drain Punch and can give stab priority to your team. It's higher attack makes up for Machamp having a great stab
Machamp can use No Guard, which gives him a great stab and 100% confusion in Dynamic Punch. Stone Edge never misses. He also has Wide Guard AND Quick Guard. Assault Vest isn't as useful because no recovery. Priority Bullet Punch