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.
Swinub is #203 in the Sinnoh Dex in Pokémon Platinum.
Vaporeon.
happiny
wormadam
its a cascoon
Swinub is #203 in the Sinnoh Dex in Pokémon Platinum.
Vaporeon.
happiny
wormadam
its a cascoon
Dusclops
Wormadam
It is Leafeon.
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.
Glaceon
Rotom
Dusclops