In Pokemon Pearl, you can complete the entire Pokedex by going through regular play and then going to Celestic Town and reading the book in Cynthia's grandmothers house. It will have a picture of Dialga. In Diamond, it's the same way but reversed (you'll see a picture of Palkia, rather than Dialga.). To find Rotom, go the Old Chateu in Eterna Forest between 8pm and 4am and go through the center door and go down the hall to one of the rooms. One of the rooms will have a TV you can examine and Rotom will come out.
There are other Legendaries in Platinum you have to obtain by special means, but the Sinnoh Pokedex for Platinum is greater than 150 so I won't bother explaining them all to you.
Lemme know if you have any other questions ^_^ I know a lot about Diamond, Pearl, and Platinum.
150 hope i helped :) Actually there are 151 pokemon in the Sinnoh Pokedex but you only have to see 150 to get the National Pokedex.
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.
Just go to Pokemon platinum central and click on pokedex and it shows you where to battle all the Pokemon in sinnoh.
Please see the related link for a complete Pokedex from the Sinnoh region.
First complete the sinnoh pokedex, 210 Pokemon
hi,There are 150 Pokemon in the Sinnoh dex.Shadowfritsch
The sinnoh pokedex can hold up to 150 pokemon.
150 hope i helped :) Actually there are 151 pokemon in the Sinnoh Pokedex but you only have to see 150 to get the National Pokedex.
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.
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.
150 on sinnoh dex 151 if you count manaphy
see all 150 Pokemon OR with ranger trade manaphy and get 151 seen then catch all the Pokemon in the world so far to beat the game
It's easy. Complete your Sinnoh Pokedex by seeing all 150 Pokemon that can be found in Sinnoh. If you've battled every Trainer on the mainland along with the Elite Four you should be fine.
Just go to Pokemon platinum central and click on pokedex and it shows you where to battle all the Pokemon in sinnoh.
Please see the related link for a complete Pokedex from the Sinnoh region.
You have to see every Pokemon in the sinnoh region.
theres more than 150 theres about 240 in sinnoh in national theres about 420 to se but sinnohs 240 :about: is included.