you must have two Pokemon ok on the title screen you should see pokewalker click on that and click go for scroll ok now you get your pokewalker and click connect and read the bottom of the game and it will tell you what to do.
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it is a pokewalker route called night sky's edge
No but they say if you do preorder it you get the jirachi thing and more features in the game
On the Main Screen go down to connect to pokewalker,and on the pokewalker press connect.Before you do that put them down on a hard surface,press the button then don't touch them until the transfer is complet.
The only way to get a Snorunt is to transfer it from your Pokewalker. You get Snorunt on Icy Mountain Road on the Pokewalker. You can also trade a Snorunt from the GTS.
NO The Pokewalker was made especially and only for SoulSilver and HeartGold, so the only way you could walk a Pokemon from your Platinum game is if you traded that Pokemon to SoulSilver\HeartGold and then transfer it onto the Pokewalker