Go to his laboratory. You'll see him and Professor Oak also.
finish the national pokedex and talk to professor rowan
you have to see 150 Pokemon then talk to professor oak..
If you are done the national dex then good for you you have completed the whole game.
Professor Rowan
You have to see all 150 Pokemon, you don't have to catch them. After that go to Professor Rowan
See all 150 Pokemon in the Sinnoh Dex and talk to Professor Rowan.
u get national dex
you have to complete the national pokedex and see professor rowan. then professor oak will come in and give you the pokeradar.
The credits roll after you beat the Elite Four. However, I would classify the game as being completed after you have seen all of the pokemon in the Sinnoh Pokedex and the National Pokedex.
go see the professor after seeing all th Pokemon in Sinnoh.
You can get the national dex from the professor after you have seen every Pokemon in sinnoh.
Well if you mean National Dex then you need to see the 150 sinnoh Pokemon then go to Professor Rowan and he and Professor Oak will upgrade it