How do you restart the pokewalker on Pokemon SoulSilver?

You can restart the Pokéwalker by resetting it to its factory settings, in order to do this, select "Connect to Pokéwalker" and then hold down the Down on the D-Pad as well as the X and L buttons at the same time, you will be prompted to delete the file and once you've confirmed the selection, it will go back to as it was while it was packaged with Pokémon HeartGold however any Pokémon in the Pokéwalker will be returned back to their original game save file so if the original file doesn't exist then the Pokémon in question will be lost.