Professor Samuel Oak (オーキド・ユキナリ博士, Dr. Yukinari Okido) is a Pokémon Professor who lives and works at his research lab in Pallet Town of the Kanto region in the human world. According to Professor Elm, Oak concentrates on Pokémon and human relationships as a profession.


In his youth, Professor Oak was a successful Trainer and a childhood friend of Agatha. They remained good friends and top-tier Pokémon Trainers before Oak became interested in Pokémon research. Despite his shift in interests, Oak is still affiliated with the League as an advisor.

Initially, Professor Elm was Oak's assistant, and Kurt assembled Poké Balls to assist with research. Oak eventually was left with three Pokémon; two of them would be given to Red and Gary Oak as their starter Pokémon.

Oak gained the admiration of many Trainers from around the world as a result of his invention, the Pokédex. Two special recorder models were given to Red and Gary Oak, as well as a starter Pokémon from his collection to start them off on his journey. Gary Oak eventually became Champion, but was almost immediately kicked off the throne by Red.

At some point, Oak started a radio show after being convinced by DJ Mary to do so. During a visit with Mr. Pokémon, Oak meets Ethan and Kris, deciding to give them recorder Pokédexes to gather the entries of the Pokémon in Johto. Silver steals a recorder Pokédex given to Professor Elm along with a starter Pokémon. He later grants the two access to Mt. Silver, where they challenge Kanto Champion Red. Afterward, the professor entrusts the two with catching Groudon, Kyogre, and Rayquaza

He eventually gives Green a recorder Pokédex to record updated information for the Kanto region, as well as Pokémon that live in the Sevii Islands.