Coliseum bug: Permanently max out Swordian Device Points
Go to the coliseum in Noischtat and select Definite Mode. Take Lion, then fight against the Cave Head on Hard or above. If you perform a Definite Strike against it (Garyuusen-> Garyuu Meppa-> Kuushuuken), your entire party will gain Swordian Device Points, even though you are never supposed to receive any at all. It's a programming error, and it allows you to keep performing Definite Strikes to permanently max out your SD Points at 999 very early, no matter how low your characters' levels are! (Note: Hard mode yields 3 points, Evil mode yields 4, and Chaos mode yields 9).
New Game+
Complete the game once, then load your save file with the triangle button.