You can't put a Pokemon in the pokewalker in Pokemon platinum, as the pokewalker was designed for only Pokemon Heartgold & Soulsilver.
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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
probably not i would think that the pokewalker would only work on heart gold and soul silver ( i have 2 ds`s and platinum/diamond and i will get heart gold)
no I can be only used for Heart and Silver
No. The pokewalker enables you to put Pokemon on it, and then you can walk around with them, but it is not essential.
By unlocking the pokewalker route