Quote Originally Posted by Alpha View Post
Does AP divide? Like, if three people finish the battle, do they as individuals get more AP than if I bring in a fourth person? I'm trying to work it out, but there's barely any delay in the post-battle screen for my eyes to focus on the number. (I'm not wearing my glasses when I play... I probably should be.)
No. AP isn't shared.

As far as AP grinding goes: High Bridge, Omega Ruins, Cactuar Village within the World of Spira. Once you get super high leveled, you can use Monster Arena exploits like Cactuar King and Don Tonberry (which Rowan made a thread about.)