Select 'Edit Wrestler', then choose the 'Name Entry' option. Enter ALL for 'Nickname', CLEAR for 'First Name', and WRESTLER for 'Last Name'. Then, set 'Exchange' to 'Off', 'Middle' to 'Space' (Square icon), and press Start. Press B until you return to the main menu. All wrestlers will now be unlocked. In the Japanese version of the game, select 'Edit Wrestler', then choose the 'Name Entry' option. Enter ki chi ji (small)yo u ji (in katakana) flr 'Nickname', ka ra (in katakana) for 'First Name', and a za bu ji (small)yu u ba n (in katakana) for 'Last Name'.