Just go to Pokemon platinum central and click on pokedex and it shows you where to battle all the Pokemon in sinnoh.
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There is only one legitimate way to complete the Sinnoh Pokedex. To complete the Sinnoh Pokedex you must trade for the missing Pokemon with Pokemon Diamond, Pearl or Platinum.
First complete the sinnoh pokedex, 210 Pokemon
in sinnoh 210
Swinub is #203 in the Sinnoh Dex in Pokémon Platinum.
Pokemon Platinum has two different Pokedexes: the Sinnoh dex and the National Pokedex. In the Sinnoh dex, #152 is Rotom. In the National Pokedex, it's Chikorita.