There could be a plot about a group of trainers who team up to take on a powerful and corrupted gym leader. They have to combine their different Pokemon skills and personalities to defeat this evil - doer in the world of Pokemon Red fanfiction.
A plot where a character discovers a hidden Pokemon species that was never part of the original Pokemon Red game. This new Pokemon could have special abilities that change the dynamics of battles and exploration in the fanfiction.
One interesting plot could be Red coming to Saffron City to challenge Sabrina. He discovers that her psychic powers are not just for battling but also a part of her inner turmoil. Maybe they form an unexpected friendship as Red tries to understand her better. Another plot could involve Sabrina having premonitions about Red's journey and she decides to join him, using her psychic abilities to help him along the way. There could also be a plot where an evil force is targeting Sabrina and Red has to protect her, which leads to a deeper bond between them.
Perhaps a plot where a dark force is corrupting Pokemon in both the Kanto and Sinnoh regions. Red and Cynthia are brought together by a prophecy. They start their journey separately but gradually realize they need to work together. Red's ability to adapt quickly and Cynthia's calm and strategic mind help them face challenges like battling against the corrupted Pokemon and finding the source of the dark force.
One interesting plot could be a trainer's journey to catch all the rare Pokemon in the Kanto region described in the Pokemon Red game. They might face unexpected challenges and make new friends along the way.
In some fanfiction, the characters from Pokemon Red and Yellow might have their Pokemon swap abilities or forms due to a strange glitch in the Pokemon universe. This leads to a whole new set of adventures as they have to figure out how to control their Pokemon in these unexpected states. They might also encounter other trainers who are both intrigued and envious of their unique Pokemon situations.
One interesting plot could be a trainer in Alola who discovers a rare Pokemon variant that's only found in the Red and Blue fanfiction world. This Pokemon has unique abilities that help the trainer overcome various challenges in the Alola region.
Another plot could involve time - travel. A device malfunction causes the world of Pokemon Red and the world of Pokemon Green to collide temporally. The trainers from both versions then have to find a way to restore the normal flow of time while also dealing with the chaos that ensues. Some Pokemon might evolve differently due to the altered time - space, and the trainers need to figure out how to handle these new forms.
One interesting plot could be a trainer who turns into a Pikachu and has to navigate the Pokemon world from a different perspective. They might struggle with their new small size and electric abilities at first, but then learn to use them to their advantage in battles.
One interesting plot could be Ash forming a unique bond with each Pokémon in his harem. For example, he might have special training sessions with different Pokémon that are tailored to their individual strengths and weaknesses.
In some pokemon zombies fanfiction, the plot could center around a scientific research facility that was working on some new Pokemon - related experiments. However, something went wrong and it led to the creation of zombie Pokemon. The story could then follow the scientists as they try to reverse the process, while also dealing with the chaos outside as the zombie Pokemon spread across the region.
One interesting plot could be about a pokemon that has been exiled due to being wrongly accused of a crime in the pokemon world. It then has to go on a journey to prove its innocence. Another plot might involve a group of exiled pokemon banding together to create their own little haven away from the judgmental eyes of the regular pokemon society.