Source: Action Replay Thread (Index -> Dial 911! -> HandHeld Help)
Quote:
16. Where to find the Games ID
Look on the back of your game on the bottom to find the ID, it will be printed in black.
Or on your AR code manager if Codejunkies has created any codes for that game they will already have the game ID programed in their game, so just drag it to your DS and add custom codes by then dragging the game to your codeslist and adding cheats like normal.
Source Somedude
1. Insert Action Replay
2. Take out Action Replay and insert the game you want to find the ID for
3. In the middle box that moves across it should say unknown game
4. in the bottom left corner it will have letters and numbers copy that down and then when you add a game you put that for the ID
Source XD_bLaZe
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WWDD? - What Would Dale Do?