Fight as Boss
Press Up, Right, Down, Left, B at the mode selection screen. Choose two player mode to access the Supervisor Robot as a fighter.

View Animation Sequences
Press Left, B, Right, B, Down, Left, Right, B at the player selection screen.

Invincibility
Press Down, B, Up, B, Down, Left, Right, B at the player selection screen to be invincible in trainer or missinon modes.