Train, play, and enjoy a nice retirement deal after traveling with Ash. Oak does research with them as well. For example he wanted Ash to leave Heracross at the lab so he could study the species more and then told Ash he would like to study Notcowl since it's a shiny pokemon
>>24576591Oaks a world renowned Pokemon research. He probably makes tons of money and uses it to help feed and care for the pokemon.
