A cool plot could be that Ash turns into a Eevee. Since Eevee can evolve into multiple forms, Ash - as an Eevee - would constantly be in a state of potential change. Other Pokemon might try to influence his evolution in different directions. His friends would be on a quest to find a way to turn him back, but in the process, Ash - as Eevee - discovers that he can access some of his old human memories and use his strategic thinking in Pokemon battles. This gives him an edge in the wild and helps him protect himself and his new Pokemon friends.
In this fanfiction, if Ash turns into a pokemon, perhaps he becomes a Charmander. He could struggle with being in a different form. He might have to adapt to the life of a fire - type pokemon, facing challenges like being weak against water - type attacks and trying to find a way to change back while still having adventures with his friends, who now have to protect him in a different way.
Well, it could be that Ash's transformation into a Pokémon gives him unique abilities. Maybe he can communicate with Pokémon in a new way and goes on an adventure to discover the reason for his transformation. However, 'lemon' in fanfiction often implies inappropriate content, so if we assume a non - inappropriate version, his new form might also lead to him having to prove himself to his friends all over again.
One possible plot could be that Ash gets hit by a strange Pokemon move during a battle. This move has a side - effect of changing his gender. As a female, Ash discovers new perspectives within the Pokemon world. She might form different relationships with her Pokemon, especially the female ones who now see her as one of their own. She could also face challenges from other trainers who underestimate her because she's now a girl, but she uses her newfound determination and different approach to battles to prove them wrong.
Well, in some 'pokemon ash turns to stone fanfiction', Ash might turn to stone because of a strange magical artifact. His Pikachu refuses to leave his side and tries to find a way to bring him back. This could lead to Pikachu having to communicate with other Pokémon in ways it never has before, like using telepathy or special signals. Maybe there's a part where Pikachu teams up with Misty and Brock, and they discover that the only way to reverse it is by finding a lost temple with a special crystal.
Well, in such a fanfic, a cool plot point might be that Ash, as a Pikachu, has to communicate differently. Since he can't talk like a human anymore, he has to find new ways to convey his thoughts and ideas to his friends. Also, there could be a plot where he discovers new powers that normal Pikachu don't have because he was once human. For example, he might be able to strategize better than a regular Pikachu in battles.
Well, if Ash were to turn into Mew in a fanfiction, it would be quite a wild turn of events. Mew is known for its ability to transform and its vast psychic capabilities. Ash, with his new form, could potentially travel to different dimensions that were previously inaccessible. He could also communicate with Pokémon in a whole new way, using Mew's psychic powers to understand their deepest thoughts and feelings.
In fanfiction where Ash turns into a girl, it could lead to some interesting plot twists. Maybe his relationships with his Pokémon would change in unique ways. For example, some Pokémon might be more protective of him now that he's a girl. Also, his interactions with other trainers, like Misty and Brock, would be different. They might treat him with more chivalry or have different emotional responses to his new form.
Another possibility is Ash becoming Lugia. Lugia is known as the guardian of the seas. As Lugia, Ash could explore the deep oceans, discover new species of Pokemon, and safeguard the marine ecosystem. He could use his psychic and flying abilities to interact with both water - and flying - type Pokemon, bringing a new era of harmony between different Pokemon types.
In fanfiction where Ash turns into a Pokemon, there are numerous possibilities. One is that he could form a deeper bond with other Pokemon. Since he is now one of them, they might trust him more instinctively. He could also be hunted by some trainers who see him as a rare or powerful Pokemon. This would put him in a difficult situation where he has to avoid capture while still trying to live as a Pokemon. And his old friends like Pikachu might have a hard time adjusting to this new Ash - Pokemon hybrid existence.
If Team Rocket turns Ash into a Pokemon, it could lead to a really interesting story. Ash would have to experience the world from a Pokemon's perspective. He'd understand their struggles, like being caught and trained. This could also be a way for him to better understand his own Pokemon and their bond with him. And it would be a wild adventure as he tries to find a way to turn back to his human form.