All Spells:
At the title screen, hold R2 and press , , , , , and . If you hear "I gotcha" you have entered the code correctly.

Quicker Spells:
To make a spell instantly work go into the inventory menu or another menu like that. While the person is casting the spell. This is very useful with the heal spell.

GameShark Codes

Max/Infinite HP       4cad7fb2  14562a45
                      4cad7fae  14562a45
  
Max/Infinite AP       4cad7fb6  1456089c
                      4cad7fb8  1456089c
 
Max Sword Weapons     3cad7fcf  1456e781

Max Axe Weapons       3cad7fd4  1456e781

Max Blunt Weapons     3cad7fd5  1456e781

Max Staff Weapons     3cad7fd2  1456e781

Max Bow Weapons       3cad7fd3  1456e781

Max Heavy Arms        3cad7fd8  1456e781

Max Parry             3cad7fd9  1456e781

Max Counter Attack    3cad7fd6  1456e781

Max Dodge             3cad7fd7  1456e781

Max Double Attack     3cad7fdd  1456e781

Max Push              3cad7fda  1456e781

Max Heal              3cad7fec  1456e781

Max Dark              3cad7fed  1456e781

Max Holy              3cad7fed  1456e781

Max Fire              3cad7ffo  1456e781

Max Magic Resist      3cad7fef  1456e781    

Thanks to Revolution readers Badday, Joseph Gray and phikapx!