From what I remember, I think I made the fight impossible for myself when I fought her. I was using Orpheus Telos or something I think, but I well, I don't think that was it. Either way I spent like an hour almost getting her to 50% so I could Armageddon her but she decided to one shot me lol. Reminds me of that one boss in FF12...spent an hour with the bosses HP stuck at 25%. I was basically trying to get it to 24%. But again, I didn't have bubble belt so I screwed myself over there and it wasn't even the hardest boss in the game lol.
I hate being one shotted by any boss. It's a big slap in the face, then stepping on you while you're down kind of moment. Speaking of which, when I about to kill the Emperor in the Emperor/Empress fight, my would be last attack missed, and the Emperor one shot me. Out of all the battles, I had to be done in like that. Ugh.
When my first PS3 got stolen, I was so far into Star Ocean. Now that I've had my new ps3, I haven't touched it. Still play the PS1 star oceans though.