Go to "Pokewalker" in the main menu. After that, press X, L, and Down on the C-Pad all at the same time. If done successfully, it should say "Caution!" at first.
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if u haven't yet erase the game data then go to connect to pokewalker from the main menu then you will see save then go for a stroll then instead of pushing the A button push down on the D-pad,the X button and the L button
use the erase buttons l x down and it will probably help find
Resetting the Pokewalker doesn't affect Routes; they are stored on your cart.
you can't
you open connect to pokewalker, you press down (and hold it), after that you press X (and hold it), the same with L