Highlight the corresponding characters in order in Decade mode and press Plus over each one before moving to the next person: Kuuga, Agito, Ryuuki, Faiz, Blade, Hibiki, Kabuto, DenO, and Kiva. Complete Decade mode to unlock Decade finish move (Complete Form). You can select it when you choose your sub-attack you want. Your choice will be either the Complete Form Finishing move or the ability to use five different Final Attack Rides. Note: If you choose Complete Form, you will only have the attacks using the ride booker.
