What is it that Professor Oak actually studies?

What is it that Professor Oak studies about Pokemon in the original US release? Is he just collecting names, or is there more to it?


According to: http://bulbapedia.bulbagarden.net/wiki/Professor_Oak

He used to be a trainer, but then retired into researching pokémon. His lab is used to research Pokémon, unravel the mysteries of these creatures, and study their characteristics and behavior in a natural environment.

Pretty much to understand the varieties out there. Kinda like a scientist that only studies whales.