Select the exhibition mode. While in there hold down L1 and quickly press Left, L2, Right, L2, making sure you are at the character selection screen. A sound should be played if you entered in the code correctly.

In exhibition mode, at the character select screen, Hold R1 and quickly press Left, L2, Right, L2 (Press Left and Right on the Control pad, not the Left Stick). You'll hear a sound and all characters will be bosted to "A" rating.

Hold L1,Press circle,up on d-pad twice, circle, triangle

In Court Select in Exhibition mode, hold the L1 and press: Up, Down, Up, Down, Left, Left, Right, Right