Professor Frigo Oak (Japanese: オーキド ユキナリ博士 Dr. Yukinari Okido) is a Pokémon Professor who resides in Pallet Town.
In the game Pokémon FireRed and LeafGreen and in the game Pokémon Red and Blue, Professor Oak lives in Pallet Town and he is absent from his lab until you try to leave town, when he runs up to you and makes you come with him. He then lets you choose a Starter Pokémon. If you go to the mart, the store clerk will give you Oak's Parcel. The Parcel contains a prototype Poké Ball, bring it back to Oak and he will give a Pokédex to you along with 5 Poké Balls. He sends you on your journey and all throughout he helps you by sending his aides out to give you items if you capture the right amount of Pokémon. In Pokémon FireRed and LeafGreen, he helps you when your rival challenges you for the first time.
In Pokémon Yellow, when the player steps into the grass they will encounter aPikachu, which Oak captures and gives to you after your rival takes the Eeveethat was intended for the player.
In Pokémon Diamond and Pearl, after you see each Pokémon in your SinnohPokédex, Professor Oak will come and hand you the National Pokédex. He resides in the most southerly house in Eterna.
In Pokémon HeartGold and SoulSilver after beating the Elite 4 for the first time you will be able to receive the National Dex from him. Also after defeating all of the Johto and Kanto gym leaders he will give the trainer the HM08 Rockclimb.
- Pikachu - (In Pokémon Yellow, he is briefly shown catching the player's starter, Pikachu, however he later gives it to the player.
- At Pokémon Yellow, Professor Oak was going to be a person that would battle you after you beat the champion. He would have a Tauros, Exeggutor, Gyarados, Arcanine and the starter that opposes your starter Pokémon at its final form. It was cut from the game and it can only be accessed through hacking or glitches.
In the Pokémon Adventures Manga
Just like in the games, he is highly regarded and known, he is the person who gives Pokédexes to the Pokédex Holders. His grandson is Blue. In Pokémon Electric Tale ofPikachu, his Charmeleon, named Char, evolved into Charizard.