Press A+B+C repeatedly on the second player controller at the Banpresto Logo screen. If entered correctly, a voice will shout ''Power Rangers'' The ''Evil'' version of the Green Ranger should be selectable in the 2P Battle Mode.
To unlock Green Ranger, you need to defeat the Dragonzord enemy with Megazord in 1P Scenario Mode. After that, Green Ranger will be unlocked as a selectable character for the remainder of the game in 1P Scenario Mode.