Things You'll Need
Instructions
Connect your Action Replay device that has the Pokemon modifier cheat to your Nintendo DS. The device will fit snugly and a visible slot should be left on the device to insert your "Pokemon SoulSilver" card into it. The Pokemon modifier cheat is:
52247d8c 582000c0
12247d8a 00004801
02247d8c e0021c39
02247d90 00000xxx
d2000000 00000000
Replace the three "X" characters in the second to last line with the number of the Pokemon you want to battle. The number of the Pokemon you have encountered are listed in your Pokedex.
Insert your "Pokemon SoulSilver" card into the Action Replay device.
Start or load your saved game.
Enter any area where you can battle a wild Pokemon. These areas include tall grass, the ocean or any caves. Once an encounter with a wild Pokemon is triggered, the cheat will automatically be activated, allowing you to battle the Pokemon.