Instructions
Place the Pokewalker and your Nintendo DS near each other. They connect via WiFi, so the closer they are, the more likely they are to connect without an interruption.
Reset your game if you're currently playing "Pokemon SoulSilver." If you're not playing it, insert "SoulSilver" into your DS and turn it on.
Select "Connect with Pokewalker" from the main menu. The option is at the bottom of the screen. Once the Pokewalker and DS are connected, you can choose to take your Pokemon on walks or transfer Pokemon to your "SoulSilver" game.