for completeing the pokedex, 100% yes
You cant get pokewalker in soulsilver when you buy it you get it at gamestop in the box is the pokewalker
You unscrew the original back of the pokewalker OFF of the pokewalker, then replace it with the back with the clip.
there are 27 areas in the pokewalker.
By unlocking the pokewalker route
To get the Pokewalker, you have to buy the game that goes with it (because otherwise, the Pokewalker is useless), which is either Pokemon HeartGold or SoulSilver.
The pokewalker is not necessary, it's just a way to find additional Pokemon and items.
You can't remove courses from the pokewalker.
Go to the dowsing on the pokewalker menu and get lucky!
yes
I assume you are talking about deleting a pokewalker from registration in order to register a new pokewalker. I apologize to report that you cannot do this. Each pokewalker is coded to work exclusively with their copy of Heart Gold or Soul Silver. Do not bother buying another pokewalker as they are a sham.
go to your heartgold or soulsilver main menu and you'll see connect to pokewalker. you can retrieve it from there by pointing your pokewalker at your ds.
You can't put a Pokemon in the pokewalker in Pokemon platinum, as the pokewalker was designed for only Pokemon Heartgold & Soulsilver.