Instructions
Remove the game from the DS and locate the sticker on the bottom of the rear of the game cartridge. The game ID is an alphanumeric number listed on the sticker. If the sticker isn't on the game cartridge, proceed to the next step.
Insert the Action Replay cheat cartridge into the cartridge compartment on the DS. Action Replay is available from most video game retailers.
Remove the Action Replay cartridge when the main menu screen appears.
Insert the "Cartege" game into the DS slot when the prompt appears on screen requesting you to insert a game. When the game is inserted, the name of the game will be listed on screen. Beneath this information the game ID will be listed.