I've got a tip for you Giga Guess and anyone else who dosen't already know about this. If your playing the GBA remake, you can use the QuickSave glitch to always encounter the rarest enemy in the area every second battle. You could use this to fight two Iron Giants in the Void castle basement to help you lv up, or three Movers of the Void near the final save point to master all the Jobs (or the most usefull ones) before fighting ExDeath/Shinryuu/Omega. You can also use it the bonus dungeon to track down Hades who's suppose to give 50,000 EXP (or 125,000 for one character with EXP UP equiped). It's also helpfull to complete your Beastiary without too much timewasting searching for them.