Summary
EveryPokemonfan knows who Professor Oak is. As a Professor in the Kanto region, he is one ofthe first characters that players will interactwith in any of the Generation One games and remakes. He also has a big role to play in thePokemonanime and has appeared in several of the spin-off games.
Despite Professor Oak’s many appearances in thePokemonfranchise, not much is known about him. Fans are aware that he is the one to give playerstheir first Pokemon and Pokedex,but that’s it. As such, several theories have emerged about Professor Oak over the years, and many are worth discussing.

6He Fought In The Pokemon War
This Theory Makes Sense If Lt. Surge Is Right
The idea of aPokemonwar has been in fans' minds ever since the Generation One games. This theory largely comes from the fact thatthe third gym leaderin Kanto, Lt. Surge, says to the player,' I tell ya Kid, electric Pokemon saved me during the war'. The fact that this man has seen war at some point is also backed up by the fact that he is a lieutenant, and dresses in army fatigues.
Now, players do not know when this ‘war’ took place, but it must have been fairly close to the start of the first games, as there is a lack of adult men in the Kanto region. As such, Professor Oak would have been aware of such a conflict and may have even fought in the war. He may not have been using Pokemon on the frontlines, but his expertise would have made him a prime candidate to work as a science advisor or strategist.

5Professor Oak Is Ash or Red’s Dad
Another Theory Based On Little Evidence
Both the protagonist of the firstPokemongames, Red, and the protagonist of the anime, Ash, grew up in Pallet Town, and both of their fathers are not present when first introduced to fans. Pallet Town is only a small hamlet with a few male parental figures. Even the two rivals from this town, Blue and Gary, are the grandchildren of Professor Oak. As such, many fans speculate that Professor Oak must be the father of either Red or Ash.
This theory would explain why the Professor is so supportive of both the protagonist’s Pokemon careers. However, there is no other reason to suggest these characters are related to the Professor other than his proximity to their houses. Therefore, this theory is only conjecture.

4Professor Oak Is A Criminal Mastermind
This Theory Suggests That Oak Has A Hand In Team Rocket
During the firstPokemongeneration,both the anime and video gamesexplore the fact that Team Rocket cloned Mew to create the first Legendary Pokemon, Mewtwo. In the anime, this story even served as the plot for the firstPokemonmovie. In both iterations of Mewtwo’s creation, it is shown or mentioned how Mr. Fuji was instrumental in helping Team Rocket bring Mewtwo to life.
Mr. Fuji and Professor Oak are both big names in the science world. Therefore, it would make sense for Team Rocket to approach Oak before attempting to recruit the kind and caring Mr. Fuji to their cause. Even if Oak refused, this means that the Professor was at least aware of Team Rocket and their goals before sending out trainers into the region.

3Professor Oak Owned Pikachu First
This Theory Explains Why Pikachu Is So Powerful In The Anime
This theory does not count toward the video games, as players see Professor Oak catch the Pikachu that Red uses as his starter at level five before the story begins. However, Ash’s Pikachu is a lot more powerful in the anime than a level-five Pikachu should be. In the first episode alone, he takes out an entire flock of Spearow, before going toe-to -toe with some of the most powerful legendary Pokemon in the franchise.
This power level suggests that Pikachu had a trainer before Ash, and has plenty of battle experience. Since Professor Oak gives Ash the Pikachu, it seems to make the most sense that it belonged to the Professor on his journey as a trainer. This theory would also explain why Pikachu wasn’t happy leaving Professor Oak behind and traveling with Ash.

2Professor Oak Gave Ash Pikachu On Purpose
Ash Would Have Been Given Pikachu Even If He Didn’t Oversleep
Everyone who is familiar with thePokemonanime is aware of why Ash was given aPikachu as his first starter Pokemon.The ten-year-old overslept, and so missed his chance to pick either a Squirtle, Charmander, or Bulbasaur. However, there is a theory that suggests that Ash would have been given his Pikachu even if he had shown up on time.
Together, Ash and Pikachu have worked to save thePokemonworld from all kinds of threats. They stopped Mewtwo and his plan to liberate all Pokemon in the first movie, and they even saved the Tree of Beginnings inLucario and the Legend of Mew.As such, it seems that these two needed to be together to prevent these catastrophes. Plus, Professor Oak is capable of foreseeing this necessity, as he has been established as a time traveler who met Ash and Pikachu in the movie,Pokemon: 4ever.

1Professor Oak Was Kanto Champion
Professor Oak Only Works In The Lab Because He Is Retired
There is little information in thePokemongames to explain how an individual becomes the Professor of a region, charged with giving new trainers their first Pokemon. Most fans have always assumed it is achieved by becoming a successful scientist. However, there are theories that Professor Oak was oncethe champion of the Kanto region.Perhaps all retired champions got to become the next Professor in the region.
This theory is mainly based on the fact that there were original plans for the first games to end with a battle with Professor Oak. In fact, this battle can still be found in the original games by exploiting a glitch. It would also explain why Oak wants players to find information onall the Pokemon in the region.