At the main menu, enter the 5th option (Edit Mode) and then the first option twice. You'll now be asked to input a name, so enter the following Japanese characters (format is Row #, Column #): - 4,4 - 3,10 - 1,14 - 1,18 - 2,5 - 7,7 (Space) - 3,4 - 1,13 - 3,1 - 5,8 -. Hit end to go to the character select screen. Now, hold Select while cycling through the characters to have the 4 hidden wrestlers available.