Instructions
Insert your copy of "Pokemon HeartGold" or "Pokemon SoulSilver" into your Nintendo DS.
Turn the Nintendo DS system on and select the "Pokemon HeartGold" or "Pokemon SoulSilver" icon, depending on which version you are playing. Press "Start" to begin the game.
Select "Mystery Gift" from the main menu, and then select "Receive Gift." Select "Get Via Nintendo WFC," and then confirm the option by selecting "Yes."
Go to any Pokemart after the map has finished downloading. Talk to the green deliveryman in the corner of the Pokemart to receive the route. Save the game.
Start the game over and select "Connect to Pokewalker" from the main menu options. Select any Pokemon from your PC box, select the Yellow Forest route and let the Pokemon transfer to the Pokewalker.