Kanto Route 9/Manga/Pokémon Adventures

Route 9 was featured from Can't Catch Caterpie! to The Primeape Directive, where and  trained at the mountainous areas of the route in preparation for the upcoming  against the Elite Four. Soon after arriving at the mountains, Yellow encountered a, which had followed her all the way from Celadon City. Following Blue's instructions, she eventually caught it and added it to her team, nicknaming it Kitty. As a result for her battles against Caterpie while trying to catch it, Yellow's, Ratty, evolved into a , much to Yellow's shock, since she hadn't been aware that Pokémon could evolve.

After training together for a while, Blue and Yellow went on their separate ways by sea. Since Yellow didn't have a Pokémon that could yet, she instead boarded the bypassing S.S. Anne to Vermilion City.

In Pokémon Adventures, the industrial waste from the unfinished to the south has spread all the way to this route, causing erosion and killing off most of the local plant life. This has also affected the food resources of the Pokémon living in the area, including a pack of, forcing them to travel far and wide in search for anything to eat.