Go into the options screen. Press Circle, Select, L1, R1, R2, L2, Square(2), Select. Every secret in the game becomes unlocked. Alternatly you can press Select, UP, R1, L2, R2 at the main menu to unlock all secrets. A sound confirms correct entry.
Hold R1 + L1 + Select + Start.
At the main menu, quickly press Triangle(2), Right, Circle, L1 or Circle(2),
Right, Triangle, L1 to enable the EX Option. Use that option to set "Original
Mode". Then, choose versus mode and have player one select both of his or her
characters. Player two should then select the same two characters in the opposite
order that player one used. Now start a game and press HP to switch teammates.
The EX Option menu may also be used to keep the power meter full. Note: For the
Japanese version of the game, at the main menu, quickly press Square(2), Right,
X, L1 to activate the code.