Ive completed the game numerous times but still cannot seem to find auto-life:-! Any help:)

Auto-Life is in the upper-lefthand corner of the Sphere Grid (http://db.gamefaqs.com/console/ps2/file/final_fantasy_x_sphere_na.gif). I think that's where Yuna starts out, but you need a Level 4 Key Sphere to unlock it. You can win those from Omega Weapon, Seymour Flux, Spectral Keeper, Land Worm, steal them from Nemesis, and bribe them from Chimera Brain. You also find them normally.

Gotta keep this thread for future refference. I never got auto life my first play through.