Instructions
Insert your "Pokemon SoulSilver" game cart into the game slot of your Action Replay DS device.
Insert your Action Replay DS device into the game slot on your Nintendo DS.
Turn your DS on to access your Action Replay DS' main menu. Select the "Codes" option to access the game list.
Select the "Pokemon SoulSilver" option to access the code list for the game. Select the "Enter New Code" option.
Enter the name of the code in the next screen, using your on-screen keyboard. Since you may not know the effects of the code, entering the name "Test Code" is advisable. Select the "Next" option to move to the next screen.
Enter the code you have created into the code entry screen. A useful tip for creating a code is to manipulate a code that already exists. For example, if there is a code that gives you an infinite amount of a certain item, you can adjust the code so it gives you an infinite amount of a different item.
Press the "Next" button when you are done making your code, and the code will be placed in the "Pokemon SoulSilver" code list.