Omega Weapon was my hardest, even using Game Shark to hack all my characters and GF's to maximum did NOT help me AT ALL! the fight lasted over a freaking hour and towards the end of it all my GF"s except carbuncle were dead, and all of my party laid dead, thinking it was over Phoenix showed up and revived me and I went into Lionheart Overdrive and finished him. That was the hardest boss fight I ever had in ANY game I ever played, it was a hell of a victory but I will never ever fight that big bastard again.lol. When the official strategy guide said Omega Weapon was way way harder then Ultimecia they weren't kidding!!