Have to beat the elite four.
Beat Wallace/Steven
there are a total of 202 pokemon
Chimecho
Raichu
weedle
420
if national pokedex you go to the other gym leaders if normal pokedex you to the left at oldale town
Yes, if you trade it you will automatically get the national pokedex on Pokemon Emerald
All 386 pokemon from Bulbasaur to Deoxys
the answer is on the website serebii.net/pokedex/dp.
hoen region and when you beat the elite for the national pokedex
Beat the Elite Four and get the National Pokedex