NHL 2002 Cheats

Get the Zamboni in introduction sequence:
Press and hold R + L and power on the Game Boy Advance. Press and hold the buttons until the Zamboni appears instead of the puck in the introduction sequence.
 

How to get bonus teams and extra creation points:
After the demo begins, then press and hold Select and rapidly tap L, R repeatedly. When the demonstration is about to end push Start but keep Select held while tapping L and R. Keep tapping them until you hear a voice say "It's in the game". If done correctly, then you should get the Budcat and Tiburon teams in exhibition mode and 1000 points for creating a player.