Yeah there is! Page 51 in the Pokewalker manual. From the main menu, choose the third option, PokéWalker. On the menu to synchronize the PokéWalker, press the Down, X, and L buttons at the same time. It will then warn that the save data will be erased and cannot be undone. Select the top option and press and hold the center button on the PokéWalker while highlighting the sync option. Within one second, the device will be reset to its initial state.