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Prof. Rowan is in D/P/Pt, because it's the sinnoh region. Johto and Kanto, Rowan has nothing to do with. Instead, He's replaced with Professors Elm and Oak.
You need to complete your Sinnoh pokedex. Then talk to prof. Rowan, after your pokedex has been upgraded, Rowan will give it to you.
u have to see 210 Pokemon to get the national pokedex from rowan
For the shinno pokedex, it is given to you from Prof. Rowan in Sandgem town at his lab. For the national pokedex, it is given to you from Prof. Rowan and Prof. Oak in Prof. Rowan's lab after completeing the Sinnoh pokedex.
Prof. Rowan's lab always stay in Sandgem Town.