Rotom is #152 in the Sinnoh Dex in Pokémon Platinum, you can find it by interacting with a TV in the Old Chateau in Eterna Forest during the in-game time of night which is between 8 PM and 4 AM.
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Swinub is #203 in the Sinnoh Dex in Pokémon Platinum.
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Dusclops
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