Oak's lab isn't in Pokemon diamond unless it's hidden. But you might be able to use action replay to make it appear. Hope i could help! Sorry the font changed.
In her house, southeast from professor's lab.
If you have played R/B/Y/FR/LG, then Professor Oak's lab must be at Pallet Town. professors oks lab is in Tokyo
in sandgem cityin front of the rowans lab which is on Pokemon hospital's left
You have to see (NOT CATCH) every pokemon in sinnoh. Then go to professor Rowans lab he'll say wow i can't belive you seen every pokemon etc.. then professor oak will come and give you the app. (i still need arceus)
yes when you are in the professor's lab
if you already have the national dex you can be able to go to his lab
No.
Professor Oak's lab is Pallet Town. - Conoogle
go to professor oaks lab then you can get a awsome kanto pokemon (squirtle)(bulbasaur)(charmander)
In her house, southeast from professor's lab.
his lab is right at the entrance of sandgem town.its a big blue building.
If you have played R/B/Y/FR/LG, then Professor Oak's lab must be at Pallet Town. professors oks lab is in Tokyo
in sandgem cityin front of the rowans lab which is on Pokemon hospital's left
Once you beat the Pokemon league, go to Sandgem town and go into the lab and talk to Professor Rowan.
Go to professor oaks lab. he will give you a starter Pokemon from the johto region. They are: Cyndaquil: fire Chicorita: leaf Totodile: water
Find if in his house near professor Oaks lab
The PokeRadar is rewarded to you after obtaining the National Pokedex from Professor Oak in the Sandgem Town Lab.