The Pokémon Peninsula > Theories > Professor Ash
Conjecture: Ash will become a professor when he's older.
Reason: Well, an ash is a type of tree. All the other professors (Oak, Birch, Elm, Ivy...) are named after trees or plants, so it stands to reason that Ash will become one too. After all, he must be named Ash for a reason.
Problem: Ash would be called Professor Ketchum, because his last name is Ketchum. A Ketchum sounds more like Pikachu's favourite food than a tree XD.
Resolution: Sudowoodo will become a professor instead XD.
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