Mega Man using the Mega Buster.
To blast out energy at foes.
Rock can use this weapon to shoot out energy to defeat foes. Although it is not a very powerful weapon, it can be incredibly powerful depending on the type of special power Mega Man has obtained from defeating Robot Masters.
List of Weapons
There are plenty of weapons that Rock can use via copying other Robot Masters' abilities, also known as the Master Weapons. The list is below. (Note: The weapons are listed in chronological order that they appeared in the comics, as well as the original user of the weapon. Also, this list is in order of when Mega Man used the special weapons, not the Robot Masters.)