For the authentic "cheat" experience on the PS1 classic, Gameshark codes remain the only method to modify core stats like Mana and Experience directly.
Disclaimer: Online leaderboards disabled when modding. Use cheats only in single-player mode. brigandine cheat codes
At the Country Select screen, hold L2 + R1 and press Start . For the authentic "cheat" experience on the PS1
For characters, there are codes that can max out stats or significantly increase them. An example could be [Triangle, Circle, X, Square] at the character screen. Square] at the character screen.