Raichu, as a Pikachu, first appeared in Gotta Catch a What?! living alongside a hoard of other Pikachu and Raichu. She discovered Goh, Ash, and Ash's Pikachu while Goh searched for a Pikachu to capture and quickly became friends with Ash's Pikachu. While bonding, Goh threw a Poké Ball at her and successfully captured her. She proceeds to shock him with Thunderbolt after being called back out.
Soon after, Pikachu discovered a Thunder Stone. She teased Ash's Pikachu by chasing him around with it before giving the stone to Goh. Right after, Team Rocket showed up and began stealing the Pikachu and Raichu, including Ash's. Goh's Pikachu volunteered to save them, and in the process touched the Thunder Stone and evolved into Raichu. With her new strength she freed her friends and joined them in blasting Team Rocket off.
In Healing the Healer!, Goh managed to capture an injured Suicune that a group of Pokémon hunters were trying to catch. After escaping, Raichu helped collect some Berries to help Suicune recover.
In JN070, Morpeko ended up at the Cerise Park and began devouring the food for Goh's Pokémon. Greedent started doing the same and the two began a fierce competition for who could eat the most. When they ran out of food and got close to blows, Raichu showed up with a large amount of Berries, ending the fight.
In JN073, Raichu joined Goh's Pokémon to help motivate the brass leader of Falinks when it became separated from its troops. Raichu offered everyone Berries and has them work together to act as a temporary replacement for the troops. Soon after, they find the missing Falinks.
Personality and characteristics
Raichu and Goh
In the daily life of the Laboratory, Raichu is the Pokémon responsible for feeding the other Pokémon that live in the place. Raichu is a very docile and friendly Pokémon, whenever she finds some Berry and other items she offers for other people and Pokémon, most notably for Pikachu. Even when they refuse, she is insistent on offering something to others. Raichu has a special affection for Ash's Pikachu, either interacting with him while eating, or giving items specifically to him.
When Team Rocket captured the other wild Pikachu, she volunteered to evolve herself so that she could save them. During the time when her friends were imprisoned, Pikachu showed a great deal of care for them. Being a key player in their rescue.
Raichu's knowledge of Berries proved useful when Goh decides to take her to find the necessary ones to cure the newly captured Suicune of Goh who had been badly injured after an encounter with a gang of Pokémon Hunters.
Raichu is seen as a peacemaker, promptly resolving the conflict between Greedent and Morpeko, this is seen again later when she replenishes their food the next day but Morpeko has already left the Laboratory. Raichu again uses this gift to help Cinderace to guide herself in the group and motivate a Falinks who had low self-esteem.
