This article is about a character featured in the Pokémon anime who has not yet debuted in the English language dub. As such, their information may contain romanized Japanese names, rather than dub names.
As seen in SS001, when she was six, Koharu invited her childhood friend Go to go to Professor Oak's Pokémon Summer Camp with her. During their visit in Pallet Town, Koharu and Go encountered the Mythical Pokémon Mew. The two chased after the unknown Pokémon, but it eventually got away in the aftermath of a baby Kangaskhan rescue. Professor Oak later told them the Pokémon they saw was most likely the Mythical Pokémon Mew.
Yamper is Koharu's only known Pokémon. It was first first seen waiting in front of the Sakuragi Institute to greet its Trainer on her way home from school, but was met with Ash and Pikachu instead. Yamper gave the overly-curious Ash a jolt, but greeted Pikachu amicably with a lick on his cheek before seeing its Trainer, confused by the scene, and following her home.
Koharu debuted in SSM01. She hoped to meet Go at the unveiling of the Sakuragi Laboratory, only for him to not show up. There, she encountered Ash, but his enthusiasm at seeing her Yamper scared her off. Later, she watched as Professor Sakuragi asked Ash and Go to become his research assistants.