The Omega Pirate may be the cheapest boss I've seen since the Sith Infiltrator from Star Wars: Starfighter. I have no idea what the rules for this fight are. I can't tell when it's possible to hit him, my lock-on keeps switching targets, and his melee attack has a HUGE damage area. It's just a waiting game until I run out of health.
Metroid Prime. If the gunship said it detected a "mobile Phazon source", then why is he in stasis when you find him...?
First, you need to shoot the Phazon armor on his body off, Plasma beam works best for this. The reason your lock on switching is that there are, if I recall correctly, 4 pieces of armor to shoot off. One on each limb.
Then after that, he proceeds to turn invisibile and send Beam Pirates after you. (Whilst uttering a sound that sounds like, "Finish her.") Interesting note: The beam pirates will always be melee or ranged, never both.
Eventually, he will appear over a puddle of Phazon, still invisible, rebuilding his armor. (And if he's hurt, healing himself.) What you want to do is attack him, with X-ray visor on (He can only be damaged with X-ray visor active, no other way, this is a notable problem for low % playthroughs.), preferably with the Ice Spreader (Ice beam combo, does twice the damage of super missile.), if you don't have the ice spreader, use Super missiles, if you're out of missiles, use Plasma beam.
Then he'll become visible again, with his armor, and it's rinse repeat from there.
Also, my avatar says hi.