Even though the Professor of a given region never plays all that crucial of a role in any of the Mainstream Pokemon Games, they still remain instrumental in helping your trainer prepare for their journey into the World of Pokemon. In the original First Generation Pokemon Games (as well as the later Remakes of the same games), Oak was the Professor of the Kanto Region. Believe it or not, Oak actually remains the Professor in Pokemon: Let's Go, Eevee, and it is he you will ultimately receive your Starter Pokemon (Eevee) from.