You could write a fanfic about a Pokemon from Pokemon Red that has a unique connection with a Pokemon in Pokemon Leaf. Maybe they are able to communicate in a special way, and through their bond, they help to bring peace between two warring Pokemon factions in the fanfic's story.
One idea could be to create a story where the main character discovers a hidden, powerful Pokemon in an unexpected place in the Pokemon Red and Leaf world. For example, in an ancient, abandoned temple.
One interesting storyline could be about a trainer who discovers a new, never - before - seen Pokemon in the Kanto region. This Pokemon has unique abilities that change the way battles are fought. Another could be a story where the main character forms an unexpected alliance with a Team Rocket member who has a change of heart.
A common theme is friendship. Their bond as fellow trainers is often explored, like how they trust and rely on each other in tough battles. For example, in many fanfics, Red might be in a tight spot during a Pokémon battle, and Leaf will come to his aid.
One plot idea could be Ash and Red teaming up to face a new, extremely powerful and mysterious Pokemon. They would have to combine their unique skills and knowledge of different Pokemon regions.
For a 'pokemon red and blue fanfic', you could write a story about a group of Pokemon that have formed their own little society in a hidden part of the Kanto region. The main character stumbles upon this society and has to learn to co - exist with them. Another plot could be that a legendary Pokemon chooses a very inexperienced trainer from the 'pokemon red and blue' world as its partner, and together they have to overcome the doubts of other trainers. There could also be a fanfic where a powerful item from the games gets corrupted and starts causing chaos in the Kanto region, and the trainers have to find a way to fix it.
A more adventurous plot could be about a time - traveling trainer. In the world of Pokemon Leaf and Blue, the trainer accidentally stumbles upon a time - traveling device. They then use it to travel back in time to the early days of the Pokemon world in these regions. There, they encounter the first trainers and Pokemon, and they have to adapt to the different rules and cultures of that time while also trying to find their way back to their own time.
A 'pokemon red x leaf lemon fanfic' could potentially be a story where the writer has taken the classic Pokemon Red game and incorporated some sort of 'leaf lemon' concept. Maybe it has to do with a new type of Pokemon that is related to lemon - like features or a character named Leaf who has a special connection to lemons in the context of the Pokemon world. It could also be a crossover where the Pokemon from Red interact with a lemon - themed world or concept.
One interesting 'red x leaf fanfic' could be about their adventures in a magical forest. They might encounter strange creatures and have to work together to overcome challenges.
One idea could be exploring an alternate universe where Red and Blue team up from the start to face a greater threat, like a new super - powerful legendary Pokemon. Another could be a story focused on their friendship growing during their journey, with them sharing tips and strategies that they don't in the original games. A third idea might be a fanfic where they have to deal with a strange phenomenon that's affecting the Pokemon in Kanto, like a mysterious illness that only they can solve.
Perhaps a fanfic where Red and Green are transported to an alternate dimension where the rules of Pokemon battles are completely different. They have to quickly adapt and figure out how to get back home. In this dimension, Pokemon have new and strange abilities, and Red and Green's bond is tested as they try different approaches to deal with the situation. Their combined experience with Pokemon in their own world becomes a valuable asset as they explore this new and dangerous place.
Well, a great plot idea might be that Red and Ash find a mysterious Pokemon that has powers neither of them have ever seen. They have to work together to figure out how to care for it and also protect it from an evil organization that wants to use its power for bad. Maybe they also learn some new training techniques from each other along the way.