Level up easy
When you have the air ship, search the coordinates x:74 y:36 or there abouts, you should find the omega ruins, go there with your three best people, but make sure they can hit at least 8000.
Equip capture weapons and catch a master tonberry, now, fly to the calm lands and fight it, every time you kill it you gain 30000 ap!!.
If youve got people who can kill it in a hit, (its got 50000 odd life) then skip everones turn until they have all had one, then kill, tou will all get the ap.
I know this is not really a cheat but it is very useful, and now all my people can hit 99999 all the time. (you need break damage limit, ultimate weapon or 60 dark matters)
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