On the title screen, press:
You can shoulder charge the opponent's goalie right after he punts by pressing A+B. The ref will NOT call a red card or any penalty. Then if you get the ball back quickly enough just shoot to score easily. It helps if you can get the goalie far out in the goalie box so he cannot recover as fast.
Reach the end of the World League on 1st place to play a special game against the World Stars Team. The match will start after the credits.