Who was the hardest Square Enix boss you've defeated?

[Aerith Great Gospel]

To be honest, X and XIII had bosses that really threw me for a loop.

The first battle with Seymour at Macalania Temple was very difficult for me. I took a short hiatus from the game after that, then I grinded my sphere grid and finally beat him. The same can me said for XIII, the first battle with Barthandelus was very difficult for me until I maxed out my grid. Cid Raines was pretty difficult for me, until I changed my party to Lightning/Hope/Fang, instead of Lightning/Vanille/Sazh that I used during the Barthandelus fight. x-x;  

[IXI Pyramid Head IxI]

Aerith Great Gospel

To be honest, X and XIII had bosses that really threw me for a loop.

The first battle with Seymour at Macalania Temple was very difficult for me. I took a short hiatus from the game after that, then I grinded my sphere grid and finally beat him. The same can me said for XIII, the first battle with Barthandelus was very difficult for me until I maxed out my grid. Cid Raines was pretty difficult for me, until I changed my party to Lightning/Hope/Fang, instead of Lightning/Vanille/Sazh that I used during the Barthandelus fight. x-x;

The hardest boss i ever faced and beat was The Long Gui,
THAT THING WAS TOUGH!
it took me 2 hours straight (lots of phoniex downs)
and the other hardest bosses i faced and baet was Ozma (beat him a few days ago) Peance( dont know what his name is neutral ) and Barthandelus (took me 27 tries to beat him) omega weapon from ff8 wasnt hard, i beat him on my second try  

[IXI Pyramid Head IxI]

The Real Raijin

Final Fantasy VIII Ultima Weapon. Lets just say, unless you did a limit break, you were taking like close to no damage on him.
Plus it didn't help he could take maximum damage, ya know? neutral

He was easy neutral
Try facing the long gui O_O;;;  

[KureshentoLucrecia]

i would have to say sin beacuse he kills you automatically
gensis beacuse hes hard beating n crsis core
sephy
the summing in final fantasy 13 when you play as snow i died cause of those summins o-o;  

[KureshentoLucrecia]

Aerith Great Gospel

To be honest, X and XIII had bosses that really threw me for a loop.

The first battle with Seymour at Macalania Temple was very difficult for me. I took a short hiatus from the game after that, then I grinded my sphere grid and finally beat him. The same can me said for XIII, the first battle with Barthandelus was very difficult for me until I maxed out my grid. Cid Raines was pretty difficult for me, until I changed my party to Lightning/Hope/Fang, instead of Lightning/Vanille/Sazh that I used during the Barthandelus fight. x-x;

i agree ;-; seymour kicked my a** in the mt gazet it was difficult to beat he killed your summing's every time whats that other boss in x that theres a hidden temple where you fight that big monster
sin for once is hard to beat to
shuyin <--- that huge machina is hard as well i kept dieing X-x