Super Mega AP
This cheat is exactly the same as the huge ap one except that you fight the cactua king in the monster arena. Go to the monster area in the cal lands and buy a weapon off the guy that has the capture ability. then go to the thunder plains and capture one of each of these monsters. Melusine, Aerouge, Buer, Gold Element, Kusariqqu, Larva, Iron Giant and a Qactuar. It is easier to catch Qactuas once you have activate the Quactua stones. One you have done that equip your weapon the same one that is said in the huge ap cheat go to the calm lands. go to the monster arena and fight the cactua king. Let the cactua king attack one of your charachters and then use a phoenix down to heal that charachter and repeat this process untill the cactua king runs away or you can flee the battle whenever you want. I have done this with Rikku And tidus and have gotten 5million ap in one hit.