She could be a Pokemon researcher's daughter. Her father goes missing while on a research trip in a dangerous part of Kanto. The female OC then sets out on a journey with her own Pokemon to find him. Along the way, she discovers new species of Pokemon and uncovers secrets about the Kanto region that were long forgotten.
One idea could be that your female OC is a trainer from a small village in Kanto. She discovers a rare and injured Pokemon that no one has ever seen before. She decides to nurse it back to health and in the process, forms an unbreakable bond with it. This new Pokemon then helps her in her journey to become the best trainer, facing unique challenges along the way.
A great plot for 'pokemon kanto journey fanfiction' could involve a group of friends starting their journey together. One of them has a Psyduck that is actually really powerful when it finally focuses. Along the journey, they encounter a strange Pokemon behavior that seems to be related to an old Kanto legend. They have to work together to figure out what's going on. The gym battles are more intense because they have to compete not only against the gym leaders but also against other trainers who are after the same rare Pokemon in Kanto. They also face a villain who is trying to disrupt the balance of the Pokemon ecosystem in Kanto by stealing rare Pokemon and using them for their own evil plans.
A plot could involve Ash finding a time - traveling device during his Kanto journey. He accidentally travels back in time and meets a younger version of Professor Oak. Together, they solve a mystery that has been affecting the Pokemon in Kanto for generations.
One idea could be Ash and Serena exploring a hidden, ancient temple in Kanto. They might discover a new, rare Pokemon species there. Another plot could involve them participating in a unique Kanto - only Pokemon tournament that has strange rules.
One idea could be a story where the female main character is a young trainer starting her journey in Kanto. She could have a special bond with her Pikachu, which she found injured in the Viridian Forest. As she travels through the region, she faces challenges from Team Rocket, who are constantly trying to steal her Pokemon. She uses her wits and the strength of her Pokemon team to outsmart them at every turn.
One plot idea could be that the female oc is a Pokémon trainer who discovers a rare male bug Pokémon in an unexpected place, like a hidden forest glade. She tries to befriend it and train it, but the Pokémon is initially distrustful because of past experiences with humans. As they spend time together, they learn to trust each other and become a powerful team.
Perhaps the Pokemon OC is from a region that has a long - lost connection to Cynthia's family. The OC discovers some ancient artifacts related to Sinnoh's lore, which Cynthia is also researching. They team up to uncover the secrets behind these artifacts, all while dealing with a group of villains who also want to get their hands on the powerful items. Along the way, their Pokemon form strong bonds with each other.
One idea could be an OC trainer who travels through different regions and gradually gathers a harem of Pokémon with unique personalities. For example, a Pikachu that's overly protective, a Eevee that's super curious. Another plot could involve the OC's harem of Pokémon helping him/her solve mysteries in the Pokémon world, like uncovering a secret about a legendary Pokémon.
Well, a plot could involve the OC trainer being from a different dimension where Pokémon relationships are different. In this new world, Pokémon are more likely to form close bonds with trainers in a 'harem' - like way. The trainer then has to navigate this new dynamic while also dealing with challenges like evil teams who want to exploit this unique relationship.
One plot idea could be Ash facing a new and powerful villain who has a vendetta against all the previous Kanto champions. This villain could be trying to rewrite the history of the Kanto region's Pokémon battles. Another idea is Ash having to defend his champion title against trainers from other regions who believe he doesn't deserve it because he's from a relatively small town. A third plot could involve Ash finding a rare and mysterious Pokémon in Kanto that has the power to either greatly enhance his team or put them in great danger, and he has to figure out how to handle it while still being the champion.
One idea could be that the OC male is a trainer who discovers a rare female Pokemon with special powers. He decides to train her and they form a strong bond as they face various challenges together. Another could be a story where the female Pokemon is in danger and the OC male has to go on a quest to save her, encountering other Pokemon and trainers along the way.