Things You'll Need
Instructions
Insert "Pokemon HeartGold" into your Action Replay cheating device. Start Action Replay and navigate to the list of codes for "Pokemon HeartGold." Create a new cheat and name it "Secret ID Finder Cheat."
Confirm the name of the cheat and enter the following code with the on-screen keyboard:
94000130 fff30000
b2111880 00000000
da000000 00000086
d6000000 00000088
d2000000 00000000
Activate the cheat code from the list of "Pokemon HeartGold" cheats. Start "Pokemon HeartGold" with the cheat enabled. Press the "Start" and "Select" button simultaneously on the main menu of "Pokemon HeartGold" to put the cheat into effect.
Load your "Pokemon HeartGold" save file. Check your Trainer Card and look at the amount of money you have. The number you see is your Secret ID number. If you only see four digits, the missing number is zero, the first digit in your Secret ID number.