How can you hack the pokewalker to get watts without walking?

You cannot cheat on the Pokewalker. The most you can do is shake it, but the Pokewalker has sensors that analyze whether or not you are just shaking it and cheating the system. Walking creates different rhythms and shakes on the Pokewalker, while shaking it is continuous. The device can tell the difference. Just walk with the Pokewalker clipped to your clothing or in your pocket.