I consider SA-X to be the real final boss of Fusion. OM is just lame, with it's silly claw swipe and slow movement.
It's not a matter of you considering, it's the last thing boss you fight in the game, it should be an option. Why do people take personal opinion where it shouldn't enter?! BTW, my vote goes for the Emperor Ing.
I hope you're joking.
Ha! I get it.
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I'm gonna have to go with the emperor ing and dark samus final fights. Fighting the Ing ruler in a three part fight to regain the last piece of light energy, followed by this creepy version of dark samus with a timer ticking down in a collapsing dark world was epic as hell.
No fight in any metroid game was even close to this epic. The second best is probably fighting Dark Samus/Aruora Unit in Corruption.
"I like my weapons how I like my music, HEAVY and METAL! - Mordekaiser
i absolutely adored metroid prime 2 for its difficulty and moody atmosphere, awesome bosses(Quadraxis ftw) and more. And the climax battle with emperor ing was one hell of challenge and fun boss fight, especially on hard mode(gc version). The epic escape sequence is just a bonus ^_^
tough call between Mother Brain and Emperor Ing/Dark Samus. I went with Mother Brain. Emperor Ing and Dark Samus probably would have won if that had been the final boss to MP3. It would have felt even more epic but noooo instead we get Dark Samus and an absurdly easy Aurora Unit.