Sandgem town after you get the pic. of them all...
You need to complete your Sinnoh pokedex. Then talk to prof. Rowan, after your pokedex has been upgraded, Rowan will give it to you.
The sinnoh dex is the first pokedex in d/p/p. The other games start with their region's pokedex, then get upgraded to the national dex IF you are NOT playing red, blue, or yellow version(s).
Pokemon #80 in Sinnoh pokedex is Barboach.
vfrt in the pokedex for sinnoh #111 in the pokedex is a garchomp
You get the sinnoh one basically after starting the game, the you get the national pokedex when you´ve completed the sinnoh pokedex (by seeing all the Pokemon in sinnoh)
Unown is the Pokemon that comes after Snorlax in the Sinnoh Pokedex.
www.serebii.net they have a 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.
Sinnoh pokedex- rotomNational Pokedex- Psyduck
The sinnoh pokedex can hold up to 150 pokemon.
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.
Registeel is not in the Sinnoh Pokedex. :)