Game Genie
6D6C-4706 + D06C-4766 Enable Debug Mode when entering Options menu

Pro Action Replay
8280AD80 + 8280AE04 Enable Debug Mode when entering Options menu

Compatible with all regions: JP,US,EU. At one time, this menu was available by holding Select while pressing Start to enter Options. But in the final retail version the branch distance for the controller check was changed to $00 to disable it.