Secret Characters:
At character select screen hold start and press: up and O,right and S,left and
X,down and T. (S=square, T=Triangle) After doing the omega rugal code , do the
reverse of it when you are playing team mode and you can select three same
characters.

Select Team Play:
At the character select screen, hold Start and press Up + Circle, Down +
Triangle, Left + X, Right + Square, Up + Circle. You should hear a tone. Now you
can select two or three of the same character for one team!