You can get it from the Pokewalker, on the "Icy Mountain Rd" area. You need over 10,000 steps in one day to get it (or 7,500 if a Fire, Ice or Ground pokemon is in the pokewalker). See http://pokemondb.net/pokewalker/icy-mountain-rd
You Have To Trade, Or Catch it in the pokewalker and transfer it to your ss.
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