At any mode except the Pennant mode, when you get to the Stadium select screen, hold Select and press Run to unlock the hidden stadium.
At the team selection screen in any mode (except the Pennant mode), hold the following buttons:
Effect Code G-San Team Hold Run and press I. Hudson Team Hold Select and press I.
Play As The Same Team
At any mode except the Pennant mode, hold II + Select and move the directional pad to be able to choose the same team as the opponent.
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