Maybe a plot where Ash gets lost in a strange region and Gladion is the one who finds him. Gladion then helps Ash navigate through this new place. In the process, they encounter various challenges and secrets of the region. Their shared experiences and the way they rely on each other through these difficulties lead to a romantic relationship between them. This kind of plot can be full of mystery and discovery, as well as the growth of their relationship.
One plot idea could be a journey where the reader and Gladion are on a quest to find a rare Pokemon. Along the way, they face various challenges that test their skills and also bring them closer together. They might have to work together to overcome obstacles like difficult terrains or powerful wild Pokemon.
A really interesting plot could be set in an alternate universe where Gladion is a normal high school student and the reader is a new transfer student. The reader discovers Gladion's secret love for Pokémon battles which he has to keep hidden from his strict family. As they bond over this shared secret, a relationship forms between them. It would be a great way to explore Gladion's character in a different setting.
One idea could be that Ash and a Pokegirl team up to save a special Pokémon that has the power to heal a dying ecosystem in the Pokémon world. During their journey, they gradually develop feelings for each other. Another could be that in a world where Pokegirls are often discriminated against, Ash befriends a Pokegirl and helps her prove that they are just as capable as trainers. This could lead to a romantic relationship.
One common theme is friendship development. They start as rivals or acquaintances and gradually become closer friends. For example, they might learn to respect each other's different training styles and Pokemon teams.
One idea could be Ash getting transported into the world of Pokemon Red. He could meet the original Red and they team up to face a new, powerful villain. Maybe a mysterious Pokemon that has powers beyond any they've seen before.
In some fanfictions, Ash and Red might have a friendly rivalry. For example, they could hold a series of Pokemon battles across different terrains to see who is the better trainer. This could involve a lot of training montages for their Pokemon, strategizing about type advantages, and some really exciting battle scenes.
Maybe in the fanfiction, Ash and Gray get lost in an unknown region while on a journey. They must rely on each other and their Pokemon to find their way back. Along the way, they discover a new type of Pokemon and have to figure out how to deal with it. This could lead to some great character development for both of them as they face challenges together.
One idea could be that Ash and Ursula team up for a special Pokemon tournament. They start off as rivals but gradually develop a deep friendship that might turn into something more. Ursula's unique Pokemon training techniques could complement Ash's own style.
One idea could be that Mewtwo and Ash are forced to team up to save the Pokemon world from a new, powerful and evil threat. They start off distrusting each other due to their differences, but as they face challenges together, they begin to understand and respect one another.
One plot idea could be that Ash's OC partner has a unique ability to communicate with legendary Pokemon. This ability draws the attention of Team Rocket, who try to capture the OC to use their power for evil. Another idea is that the OC is from a far - off region and has a different approach to Pokemon training, which challenges Ash's traditional methods and they learn from each other. A third idea could be that the OC has a mysterious past related to a powerful and lost Pokemon species, and Ash and the OC embark on a journey to discover the truth about it.