Unown is the Pokemon that comes after Snorlax in the Sinnoh Pokedex.
Finneon.
Misdreavus
If you mean on the national pokedex, there is a VERY long list. In Sinnoh Dex, unknown and riolu (baby lucario)
Its Phione in Pokemon Platinum, You can get it by breeding a Manaphy and a Ditto Actually; Rotom comes after Manaphy in the Platinum pokedex. Kthnx. http://pokemon.marriland.com/platinum/pokedex/list/sinnoh/ Rotom comes after manaphy in the platinum pokedex phione can be made by breeding a manaphy and a ditto but he's actuelly not in the platinum pokedex :D
Pokemon #80 in Sinnoh pokedex is Barboach.
vfrt in the pokedex for sinnoh #111 in the pokedex is a garchomp
In the National Pokedex, where Weavile is number 461, Magnezone is after Weavile. In the Sinnoh Pokedex, where Weavile is number 145, Uxie is after.
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)
www.serebii.net they have a pokedex
Glaceon http://www.serebii.net/pokedex-dp/471.shtml
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.