I gotta say that the first time I played ffx, seymour 1 was my nightmare
I was so dumb that couldnt kill anima at the beggining

really, seymour 3 wasnt that hard after all
when I first played the game (I was a noob)
it still wasnt hard cause I used all my aeons overdrives, and then auron to finish him off

the second time I played it
I beat all the seymours in like 2 minutes
really, seymour 3 aint that hard, I was really overpowered by the time


I remember that when I played seymour 4
all I did was enter the battle with tidus yuna auron, switch chars in order to make everyone have a roll on the fight (so everyone can get exp)
and make a one hit kill with valefors energy blast (99 999 hp off)

and thats it

its all about overpoweredness