seriously, not to brag man, but i killed him on one hit, 99,999 damage from one attatck. u should get all the ultimate weapons, or atleast for the guys u play with, and jecht should b easy, seriously dont worry about def. or anything, keep using tidus's quick hit, and ull b good, my party was tidus, auron, wakka, and one quick hit(99,999) killed him, but i do i have 80hrs worth of traing, but seirously u can do it man, or use ur aeons as sacrfices to jecht wen he attacks!