[Kind of odd that he never spoke to Professor Elm, but she shrugs it off. Maybe he left New Bark too quickly and never went to the lab.]

That's a pretty good question. I know Professor Elm lives in New Bark, so if anyone's around there maybe they can meet with him... I don't know anyone who's there, though. Professor Oak resides in Kanto, I believe, but I'm not sure of the town specifically. Probably whichever one you arrive in if you choose to take the ferry.