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.
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To get a starter from him you have to beat red at mt silver.
Prof. Rowan's lab always stay in Sandgem Town.
He's not in firered only in gold, silver, crystal, heartgold and soulsilver.
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.
No he doesn't