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.
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
complete the sinnoh pokedex and talk to professor rowan.
in sinnoh 210
After you go to the Pokemon lab for the first time, Professer Rowan will ask if you would complete the Sinnoh pokedex. Answer "Yes". He will give you the Sinnoh pokedex. If I didn't answer your question right, try Psypoke.com If you don't have Pokemon Pearl/Diamond/Platinum you can't get the Sinnoh pokedex.
A way to complete your sinnoh dex is to battle every trainer, Nintendo made it so if you battle every trainer you will complete your sinnoh dex.
You can either hatch them or run into them with the pokerader. To get the pokerader, you have to complete the sinnoh pokedex.
I am not going to list the list here, but here is how to open it online:1. In Google, type 'national pokedex platinum'.2. Press 'return' or 'enter'.3. Click or Double click on 'Pokemon Platinum- The National Pokedex'.Then the Sinnoh Pokedex will appear (even though it says National Pokedex, it's the Sinnoh Pokedex with the location and/or a trainer with the Pokemon)!
No you dont, just the national dex
Swinub is #203 in the Sinnoh Dex in Pokémon Platinum.
Porygon
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.