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Deals damage and has a critical hit rate one stage higher than normal. Assuming there are no other critical hit modifiers in play, this move has a 1/8 chance to get a critical hit instead of a 1/16 chance.
Not a useful move competitively speaking. Low Base Power and bad distribution essentially kills any use it could have had. With only five fully-evolved users available and every single one of them having a better option for a Fighting-type move, there is literally no reason whatsoever to use it. At all.
Close Combat is an option with higher Base Power and accuracy, but lowers the user's Defense and Special Defense stats after use.
Superpower is an option with higher power and accuracy, but lowers the user's Attack and Defense stats after use.