See all the Pokemon in the region
by finishing the first pokedex and then professor oak give you the national pokedex
You have to see every Pokemon in the Sinnoh Pokedex first and then you have to talk to Professor Rowan to get the National Pokedex.
you have to beat the sinnoh pokedex, talk to professor rowan and professor oak will come and give you one
yes the national pokedex
You get it by going to Professor Rowan with your sinnoh pokedex completed and Professor Oak will rush in and give you the national pokedex and the Poke Radar.
first get all the Pokemon on your normal Pokedex then go to the professor and you will get the nationaldex.
You go to Sandgem town then you go to Professor Rowan's Pokemon Research Lab.You have to talk to him and then Professor Oak will come in and he will give you the National Pokedex (But first you needed to have finish the Sinnoh Pokedex.) P.S When you talk to Professor Rowan he will give you the Pokeradar.
You have to of completed the first pokedex then go and see Professor Rowan
you get it from professor rowan after you get the national pokedex
you get it from professor oak once you have completed the sinnoh pokedex. first you go inside rowans lab then professor oak will give it to you
beat the elite 4, and you have seen all 210 pokemon, then go and talk to professor rowan in sandgem town. when you do, professor oak will arrive and upgrade your pokedex to the national version. you will also get the ppokeradar.
well go back to the professor and he will give it to you