Most difficult boss fights?

[Jessweeee♪]

I forgot about FFX-2's Via Infinito.

Like, every boss in that place.

[Hollycat]

1. minerva cc- dear lord, this thing takes hours to beat when doing 99999 damage each hit. Plus she has an attack that peirces pheonix down and does often over 70000 damage, and couples that with repeated attacks. That attack can wipe you out no matter how well prepared you are if she does it twice
2. ruby weapon vii- I just hate this thing, takes way to long to fight. I beat him once, never doing it again
3. emerald weapon vii- way too hard to beat without first mastering every materia and getting the master materia
4. hell wyrm xii- this thing is just as tough as minerva almost, so much harder than yaizmat
edit:
5. babylon iv- this thing kicked my ass so many times I gave up

[Sephiroth]

Simply everything in the original Final Fantasy for NES and the CPU in Final Fantasy IV DS.

Battle begins.

"Laser Beam"

Battle Over.

[theundeadhero]

The Guardian Statues of FFVI, and Bahamut's wife in FFIV?

No, they were mentioned more than once to say how not hard they are.

[Rase]

It's Leviathan's wife.

And so I semi-contribute, Zeromus was decently hard in the original IV and the DS remake (though I abstained from using Augments, so maybe that was why).

[Vyk]

The Guardian Statues of FFVI, and Bahamut's wife in FFIV?

No, they were mentioned more than once to say how not hard they are.

xD Yeah. I totally admitted that most of my trouble was lack of preparation. Considering I was in Jr High or High School and only played most of the series just once each, I forgive myself. But my experience doesn't speak for anything. Had I went through those games a second time I probably would have stomped them. But I had no clue about exploiting the system. Hell I didn't learn to heal undead enemies until FF8 (I think). Let alone the idea of casting reflect on a boss so they can't heal themselves. That'd make that fight as easy as taking four reflect-rings to the fight at the top of the tower of Zozo~