The Mega Arm was introduced in Mega Man V. Mega Man can charge and fire his forearms at his enemies. His fist will then return to Mega Man's arm. Using the MH and CL adaptors, the Mega Arm can be used to grab items from a distance and to rapidly and repeatedly strike an enemy
also for a final smash the Double Rock Buster may be a good idea
The Double Rock Buster charges a large amount of energy in both busters, which he then fires simultaneously to generate an incredibly powerful charged shot