Well, you can VS. every trainer you see until you see a new Pokemon if you've seen all the wild Pokemon, or if you haven't seen all the wild Pokemon available. Oh, and by the time you get to the Elite Four and you still haven't seen all of the Pokemon, challenge the Elite Four, and you'll probably get your Pokedex done after that. *wink* Good luck with Sinnoh roaming legendary's! (For example, Mesprit and Cresselia) Happy Pokemon hunting! :)
its very hard .first complete the sinnoh pokedex and then look where you find it or get the Pokemon diamond and pearl 2°guide 20 $ includes pokedex national and much other stuff pricey but worth it (i have it)
See all 150 Pokemon in the Sinnoh Dex and talk to Professor Rowan.
you have to see all of the Pokemon and then you get the national pokedex from Prof. Rowen and Prof. Oak in Prof. rowen's lab after completeing the Sinnoh pokedex.
yes i have completed the game. just vs every trainer you meet, and once you've beaten the elite 4 you've seen every Pokemon in sinnoh! Go down to prof. birch's house and you'll get the national dex which is a lot harder to complete (half of the Pokemon in there you cannot see in sinnoh)
you need to see all the Pokemon in sinnoh region One Pokemon I found hard to see was the riolu, but you get it from Riley when its in a egg but basically you do nothing. Let it evolve.
yes.
You need to see all Pokemon in sinnoh
you have to see all the Pokemon in sinnoh.
you have to see all the Pokemon in sinnoh
You have to see all Pokemon Pokemon. But not the ones on nationaldex.
go and see all the Pokemon in the sinnoh dex
by going all over sinnoh and by trade
You have to see all the Pokemon in the Sinnoh Pokedex.
You have to see all of the Pokemon in the original pokedex.Then,go to Rowan in Sadgem Town.
You have to see all the Pokemon in the sinnoh dex not including manaphy
See all 150 Sinnoh Pokemon
He is in Sandgem Town, in the Pokemon Lab after you see all the Sinnoh Region Pokemon.
yes and to do so just see all the Pokemon in sinnoh to complete the sinnoh dex