Instructions
Situate both the Pokewalker and the Nintendo DS near each other on a flat surface. Turn on both devices by pressing their respective power buttons. Make sure either "Pokemon HeartGold" or "Pokemon SoulSilver" is inserted into the Nintendo DS.
Press "Start" on the Nintendo DS to move past the "Pokemon HeartGold" or "Pokemon SoulSilver" title page. From the main menu, select "Connect to Pokewalker." Choose the "Go for a Stroll" option from the next screen. You will be taken to the PC boxes for which your Pokemon are stored. Select one of your Pokemon and click "Confirm." Select the route you want the Pokemon to walk on and click "Connect."
Click either the right or left button on the Pokewalker to open the device's options menu. Press the Pokewalker's middle button to select the "Connect" option. The Pokemon you selected from the Nintendo DS will now be transferred. Upon successful transfer, both the DS and the Pokewalker will chime audibly.
Begin walking with the Pokewalker. Walk around with the Pokewalker in your possession to get your Pokemon walking. After completing a certain amount of steps, you will receive Watts, which are used to open new walking routes, to catch rare Pokemon and to find rare berries and special moves.