Instructions
Play as Magic Johnson in any of the game's modes. To unlock Magic Johnson, you have to defeat the Bird/Magic Superteam in the game's Classic Campaign mode.
Dribble the ball in front of a defender. You can steer Magic Johnson by using the analog stick on the Nunchuk attachment required to play the game.
Press the "B" button and the "Z" button simultaneously, to activate Magic Johnson's crossover move. If you are close enough to the defender, he will have a very high chance of falling over, because of the speed and ball-handling skills of Magic Johnson.