Quote Originally Posted by Old Manus
Tonberry method defo works, but gets old and you have to be very good to reap the benefits.
Not really. All you need is a weapon with the Overdrive -> AP ability (and if you want to speed the process add Triple AP and Triple Overdrive) and a person who has low HP but has killed a lot of fiends. You can gain 99 S.Levels in around 30 seconds if done correctly. The only 'hard' part is acquiring the weapons.