Answer 1

Machoke: Base attack 100
Graveler: Base attack 95

Machoke also has higher stats in total. The only stat Graveler has that is higher than Machoke's is defence, but since Graveler is weak to so many things, it's hardly useful.

Machoke
Graveler

EDIT: also Machoke has Guts, which increases its attack by 50% when inflicted by burn, poison, paralysis or sleep.

Comments

Also noguard...

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That doesn't really increase power, it just makes sure its move hits.