>>54919855Oak is an odd relic from the brief period in time when the original Red and Green were released and Game Freak hadn't decided if Pokemon were substitutes for animals, or weird creatures that lived alongside animals in the real world
He's called the "Pokemon Professor" because he was one of the only people putting serious effort into studying them
This has been retconned and made less relevant with each game that has been released since, as being a Pokemon professor is no longer special at all, and the only distinction he has is that Oak supposedly invented the Pokedex, which also makes little sense from a lore standpoint