Team Attack's.

Since their are multiple robot masters from different groups it would be awesome if you can take advantage of it and employ their attacks for a team work attack.

Like Using megaman's copy of Thunder Beam and Elec Mans thunder beam creating a double thunder beam.

Or maybe using Metal man's Metal blade is used in conjunction with Heat man's Atomic Fire. To super head that blade to the point of it's glowing hot. Thus making a combo cutter fire attack weapon.