Peanut Butter is a golden Bidoof who has the physique of a body-builder and a Bidoof's head. It has red shorts and a sparkly body and has the ability to speak.
Peanut Butter is loyal to his 'Father', Rusty. It is implied that he killed nearly every Pokemon Trainer holding a badge, and has killed Agatha on Screen. After learning about the cruelness of mankind to Pokemon, he learns "Compassion" which then Rusty told him to forget. He learned "Thirst for Vengeance", he enslaved the world under the impression that all human beings are evil. He learned from Good Rusty, that there is good in the world, and now seems compassionate.
Perfect Bidoof returned in "Jailbreak", calling Rusty his father from when he (and Julian) had created him. He rescued Rusty from a jail fight and broke him out of prison. Rusty nicknamed him "Peanut Butter."
In "The Elite Four", Peanut Butter teleported as Rusty called him. He carried a sack full of all of Kanto's badges from any trainer that held badges. Rusty didn't know what happened because Peanut Butter told him to cover his eyes when they gathered all of Kanto's badges and politely ask to battle them. Rusty used Burbasaur to fight against the Elite Four member Agatha and her Gengar, then Peanut Butter tells Burbasaur to rest because Burbasaur cannot fight due to organ failure. He says "Bidoof" and it casts a spell onto Agatha, causing Bidoofs to come out of her eyes and mouth to her excruciating death. After the incident, the remaining members fearfully congratulated Rusty as new Elite Four member. Rusty then sees that he hasn't caught all the legendaries and tells Peanut Butter teleport to McDewgong's to eat some food before going after the legendaries.
In "Legendaries", they arrive at the nature reserve where the see Suicune. Rusty then asked Peanut Butter to use one of his moves, but Rusty ask what are his moves. Peanut Butter shows him one of his moves by sending a very big energy blast that is visible from space, after the blast the Suicune is in a big crater and is nothing but bones. Shortly after, the tour bus arrives and invites Rusty and Peanut Butter to join them. During the tour they are shown various legendary Pokémon and see that Legendary Pokemon are not gods, and they are very endangered. They drive along to see Arceus, then a poacher arrives to send him to a Kalos businessman. Peanut Butter sees an example of mankind's cruety realizes his true opponent and then informs Rusty he has learned "Compassion" but already has four moves. Rusty then tells him to forget "Compassion" to which he promptly does and then informs him that he wants to learn another move called "Thirst for Vengeance" Rusty agrees to let him learn the move. Peanut Butter then kills the poacher and says that he thought proclaims the age of man is over and the eon of "Doof" has begun for his companions sake. Rusty says that he will do that by doing everything Rusty says.
Six Months Later, Rusty and several slaves are seen building a statue of Peanut Butter with giant muscles and after singing, Rusty is lashed and falls to the ground form a ledge to work on. Rusty is rescued by Battle Bart and brought inside a hideout where he has to rewind time so he doesn't create peanut butter. he is also told that Red brought a bunch of trainers to fight peanut butter but they were killed by his magic. After he comes back EV Trainer questions what happened while a red laser cuts through a wall behind him. The wall then explodes with Ev Trainer falling to the ground bleeding and peanut butter coming out of the hole in the wall. He then gets prepared to fight Rusty who throws pokeballs at him and fails. In the Final Episode, Peanut Butter prepares to kill all of humanity. Rusty attempts to stop him again by throwing a Pokeball and once again failing. Just before, Peanut Butter kills Rusty and the rest of his team, Deli Rusty arrives with the sandwich ordered by Battle Bart. Here Peanut Butter eats the sandwich and has a new found hope in discovery. He then takes Deli Rusty and Sexy Clefairy to space to explore the wonders of the universe leaving normal Rusty behind to forever work in the Deli.
After Rusty went back in time and reran his adventure to the present. Peanut Butter discovered the secret hideout for Anti-Bidoof Resistance using a red laser. He prepared to finish off the remaining members. As Rusty failed to use his Pokeball to capture him, he declared they will be "one with Bidoof" meaning dead. Some of them freak out and Peanut Butter turns a member into a Bidoof and causes him to expode, he also transformed Professor Tree into a Bidoof.