Mogenar
Discovered by Prime Hunter
If you're fast enough and close enough to him, when he opens his mouth try to shoot an Ice Missile at him. If it hits before he closes his mouth, he'll be stunned for about 5 seconds with all of his orbs exposed, allowing you the perfect oportunity to blast him.
Discovered by petrie911
Fight in 4:00 (Hyper Mode difficulty) http://www.youtube.com/watch?v=Xrr9DH7mE2M
"First and foremost, Hyper mode your way through each orb. It's best if you wait a little for Corruption to set in, or you'll probably find yourself running out of phazon. Otherwise, go nuts, and let mogenar's attacks refill your meter. For the part where you attack his feet, go in and out of Hyper Mode to avoid damage from his feet and shockwaves." (YouTube comment)