Helios

Discovered by Paraxade

As soon as the fight starts, start charging a hyper shot and walk underneath him (this is so the bat things don't get in the way) and shoot it all at him. This stuns him. Now shoot a fully charged shot at Helios, then take a hit to get more Phazon. Then shoot another fully charged shot, and start charging the next. This is where Helios starts calling the bat things back to him; when the charge shot becomes fully charged, shoot it again to instantly stun. Repeat until dead. This allows you to get a fight where he never uses any of his forms.

(this is on Hypermode, btw - normal/veteran might need to shoot less than two fully charged shots to return him to normal and less than one fully charged shot to stun)