One idea could be a story where the main character discovers a new, rare Pokemon in an unexpected place, like in a hidden cave in Viridian Forest. Another could be a fanfiction where the Pokemon trainers from Red and Yellow team up to face a new, powerful villain who has a unique ability to control Pokemon in a different way than the usual villains in the games. Maybe also a story about a trainer's Pokemon evolving in a very different way due to some strange phenomenon in the Kanto region.
Well, you could write a fanfiction where a group of Pokemon from Pokemon Red and Yellow decide to go on their own adventure without their trainers. They form a sort of Pokemon - only society and have to deal with problems like finding food, shelter, and protecting themselves from other wild Pokemon. Another plot could be that a new type of Pokemon appears in the Kanto region that doesn't fit into the existing type system, and the trainers from Red and Yellow have to figure out how to battle it and catch it. Also, a story about a trainer who loses all their Pokemon but then befriends a group of misfit Pokemon and trains them up to be a powerful team could be really interesting.
Perhaps a fanfiction where the main character discovers a time - traveling device in the Pokemon world. They travel back to the very beginning of the Pokemon Red and Yellow era and have to prevent an event that would change the future of the Pokemon world in a bad way. Along the way, they meet the original Professor Oak as a young man and help him with his early Pokemon research.
One idea could be a story where Red and Yellow have to team up with their Pokemon to stop a new and powerful villain who is stealing rare Pokemon. Another could be a story about their journey to discover a hidden Pokemon species that is said to have special powers. And they could also face challenges like a natural disaster in the Pokemon world and have to use their skills and Pokemon to survive.
One idea could be a story where the main character is a Pokemon trainer who discovers a rare and powerful Pokemon that no one has ever seen before. They then have to protect it from evil organizations who want to use it for their own gain.
A great plot could involve a time - travel aspect. The protagonist is sent back to the time when Pokemon Yellow was first set, and they have to use their knowledge of modern Pokemon training and battling to change the course of history in the Pokemon world. They might also meet the original trainers from the game in a different way and form new alliances.
One idea could be to focus on a new trainer's journey in the world of Pokemon Yellow. They could start with a Pikachu that has a unique ability not found in the original game.
A cool plot could be that Lance, in the Pokemon Yellow world, decides to start a new type of Pokemon training school. He recruits the protagonist from the game as his first student. Together, they develop new training techniques and discover new Pokemon evolutions. But an old rival of Lance hears about this and tries to sabotage their efforts. So they have to not only deal with the challenges of training and discovery but also fend off this rival who is jealous of Lance's new project.
Well, a plot could involve Red going back to the starting regions to relive his early days, but this time with a twist. He might find that the Pokemon he once caught have developed in unexpected ways, or there could be a mystery about some strange occurrences in the areas he first explored. It could also be about Red training a new, inexperienced trainer, passing on his wisdom.
One idea could be a crossover between the two generations. For example, a trainer from the Red era travels to the Gold region and has to adapt to the new Pokemon and different gym challenges there. Another could be exploring the backstories of some of the less - known Pokemon in both games. Maybe there's a hidden mystery about a certain Pokemon's evolution that a fanfiction could uncover.
A plot could involve Erika's gym being threatened by a mysterious group. Red comes to her aid. Along the way, they learn more about each other's pasts. For example, Erika might reveal how she became so passionate about grass - type Pokemon. They train together, combining their skills and Pokemon teams to defeat the group and save the gym. This could also lead to a budding romance between them.
Well, a cool plot could be that there's a strange distortion in the Pokemon world that pulls Red and Cynthia together. They initially clash because of their different approaches to training, but as they face various challenges like a powerful villain with a new type of Pokemon, they start to respect and learn from each other. Maybe there's also a sub - plot where they both have to deal with their own personal Pokemon that have some special connection to the events. For example, Cynthia's Garchomp and Red's Pikachu might have some unique interactions.