You can't delete the data on the pokewalker it only works on the heartgold or soulsilver versions that you bought it with sorry.
don't listen to this retard(no offence)you can delete the data,by simply pressing down+X then click the L button,it will show a warning,commform it,then boom that's how you delete a pokewalkers data hope it works.
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you open connect to pokewalker, you press down (and hold it), after that you press X (and hold it), the same with L
At the title screen, press Up+Select+B. It will ask you if you want to delete your data. Note that all Pokemon on your pokewalker will be deleted also.
If you reset your pokewalker your Pokemon will go and all your data will be deleted. That includes the steps places and watts. DONT BOTHER DOING IT UNLESS YOUR HAVE STARTED A NEW SAVE AND THERE IS A POKEMON ON THE POKEWALKER WITH A POKEMON ON IT!!!
When the screen says, "This Pokewalker has already been registered" or something similar, it means that Pokewalker has been registered to a different game card. In order to send your Pokemon on a stroll with that Pokewalker, follow the instructions below. On the menu screen, select "Connect to Pokewalker". This will take you to the Pokewalker menu. On this screen, hold the DOWN button, the X button, and the L button. This will give you a warning to reset everything on the Pokewalker. Select Yes, and follow the instructions given to reset all the data on the Pokewalker. This will not delete your Routes, however. Afterwards, follow the on screen directions to register your Pokewalker again. This will allow you to send Pokemon on a stroll in the Pokewalker again. If your Pokewalker gets broken or lost with a Pokemon on a stroll, on the Pokewalker menu, hold the UP button, the SELECT button, and the R button to force your Pokemon back into it's PC Box in the HeartGold or SoulSilver game. Take note you will not receive the items and Pokemon you found.
To delete the acount