To view the credits for Street Fighter Zero Fighters Generation, you must have all the games unlocked (even all arrange versions) including Hyper Street Fighter Zero.

To get to the credits staff roll, highlight Street Fighter Zero 1 from the main menu and press Select + any button you use to select it (the main buttons that confirms a menu choice) then once your in the choices for game modes at Hyper Street Fighter Zero go to Options, and hit the R1 button plus the confirmation button and you will see the staff roll (credits) for Hyper Street Fighter Zero.