Professor Oak's assistants stationed at several gatehouses around Kanto. They will hand you valuable items like HM05 Flash (Route 2, requires 10 Pokemon caught) or the Itemfinder (Route 11, requires 30 caught) and Exp. All (Route 15, requires 50 caught).
Found At
Where something is met, and how. Characters are here as well as creatures: the guide records where Professor Oak stands and where each Gym Leader is fought.