Chuchu wascaught about three years afterYellow's first appearance in theRed, Green & Blue arc. InTyranitar War, Yellow mentions that she found Chuchu injured inViridian Forest and took her in. After introducing her to her uncleWilton, he notes that Chuchu had grown quite attached to her and expounded on his real objective, which was to ask Yellow to go to theJohto region with him to investigate aboutLugia. Because the sheer magnitude of a monster that they are dealing with does not leave him with many options alone, he needed someone to go with him, and Yellow came up with the idea to askRed. After Yellow found him training near Viridian Forest, Chuchu seemed to take a liking toPika soon after they met. However, with Red's wrists and ankles still weak from the damage thatLorelei's ice cuffs left on them, he needed to recover at the hot springs ofMt. Silver, and left Pika behind. Alongside Pika and Yellow, Chuchu flew to Johto onKitty with Wilton'sButterfree.
InDo-Si-Do with Dodrio, they encounteredCrystal after the latter mistook Pika for a wild Pokémon.Soon, however, the twoTrainers got involved in Lugia's rampage and lost consciousness in the shipwreck.
Following the incident, Chuchu and Pika produced anEgg inPlayful Porygon2 when Pika spent time with her in the JohtoDay-Care Center. When someTeam Rocket members attacked the Day-Care Center, Chuchu, in a desperate attempt to protect her egg, flew, with the help of balloons, carrying Pika and their Egg. When theMasked Man took the three hostage nearIlex Forest,Gold embraced their Egg and took a number of blows to guard it, hatching thePichu that the Egg contained. WithPichu's assistance, the boy eventually succeeded in defeating the villain, and Chuchu's offspring was left in his care.
InSecrets from Sneasel, Yellow and Chuchu enter theViridian Gym to see ifBlue and Red have returned. They find the Gym empty when suddenly a hologram of Blue appears from behind Yellow. The hologram is revealed to be a pre-recorded message designed to battle challengers even when Blue isn't in town. Chuchu tells Yellow that she wants to fight, so Yellow decides to take the challenge. Blue'sPidgeot starts off the battle withFeather Dance and follows up withWing Attack. Next,Alakazam is sent out and usesRole Play to copy Chuchu'sAbility,Static. Alakazam uses the Ability to paralyze Chuchu, defeating her.
Static activated via Role Play
Through a chain of events, shelater found herself in Red's hands after Yellow spent the last of her energy informing him ofDeoxys's message, and assisted in defeating the tenForretress thatCarr had placed inside theTeam Rocket airship alongside Red's Pokémon andBlue's Charizard. Afterwards, she returned to her sleeping Trainer.
Two months later, she and Pika, who were thankfully able to escape the beam that left their Trainers petrified, traveled with Gold and Crystal to theHoenn region to help saveJirachi. Soon, Gold also revealed that the two and his own Pichu, Pibu, had learnedVolt Tackle to help out, and after the remaining five of thePokédex holders succeeded in freeing their comrades, the three dealt the finishing blow toGuile Hideout's giantKyogre monster.
Personality and characteristics
Chuchu, Pika, and Pibu
Chuchu is a kind and caring Pokémon, much like herTrainer. Chuchu cares greatly forYellow and is often the only one of her teammates outside of herPoké Ball. Despite Yellow not being much of a battler, Chuchu is capable of fighting and occasionally insists on participating in battles.
Upon meetingPika, she instantly sparked a connection with him and has since become his mate. Chuchu also cares greatly for her sonPibu.
In a special memorial illustration by series artistSatoshi Yamamoto, Chuchu is shown with a heart-shaped tail shared by all other female Pikachu, when she was previously depicted without one.
