Ash could have a hard time adjusting to his new Pichu form. He's used to being a human trainer, but now he has to deal with being a small, electric - type Pokémon. He might accidentally shock his friends at first because he doesn't have full control over his new powers. For example, when he tries to communicate with Pikachu, he might send out a jolt of electricity instead of making a sound.
The fanfiction could explore how Ash's relationships change when he turns into a Pichu. His Pokémon might see him in a different light. Some might be more protective, like Pikachu, while others might be confused. His human friends like Misty and Brock would also have to adapt. They might have to carry him around because he's too small to keep up on his own. And Ash would have to rely on non - verbal communication more, which could strengthen his bond with his Pokémon in a new way. He might also learn some secrets about Pokémon behavior that he didn't know before, which could make him a better trainer when he eventually turns back into a human.
One possible story could be that Ash is hit by a strange Pokémon attack that turns him into a Pichu. As a Pichu, he has to rely on his Pokémon friends in a whole new way. Pikachu, for example, might take on a protective role, guiding Ash - now a Pichu - through the challenges they face. And Ash would have to learn to control his new Pichu abilities like using Thunder Shock in a more instinctive way since he's now in a Pokémon's body.
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.
Maybe Ash as a Vulpix gets adopted by a group of wild Vulpix. He has to learn their ways and how to survive in the wild. He could also learn some unique Vulpix - only skills that he can later use when he turns back to his human form.
Well, if Ash turns into a legendary Pokemon, he'd likely gain a whole new set of powers. For example, if he becomes Arceus, he'd have the power to create and shape the Pokemon world. He could create new Pokemon species or even reshape the existing regions. His friends would probably be both in awe and a bit scared at first. But Ash, being Ash, would still have his kind heart and would use his powers for good.
Well, perhaps Ash could gain new and amazing powers. Shiny pokemon often have special abilities or appearances, so if Ash turns into one, he might be able to fly like a shiny bird - type pokemon or have super strength like a shiny fighting - type. He could also use his new form to communicate better with pokemon, since he'd be more like them.
Perhaps Ash, as a Victini, would attract a lot of attention from other Pokémon and trainers. Some might see him as a symbol of hope and victory, while others could be jealous or even try to capture him for his powers. His friends, like Pikachu, might be initially confused but would eventually learn to accept this new form of Ash and help him navigate the challenges that come with being a Victini.
Well, he might start to see the world from a Pokemon's perspective. For example, he could understand their communication better and form closer bonds with them. He may also face new challenges like having to adapt to living in a Pokeball or dealing with the natural instincts of his new Pokemon form.
If Team Rocket turns Ash into a Pokemon, his relationship with his old Pokemon would change. His Pokemon might not recognize him at first. But as they sense his familiar spirit, they could try to protect him. And Ash, in his new form, could learn a lot about the true nature of Pokemon. He could discover secrets about their evolution, abilities, and the hidden powers within them that he never knew as a human trainer.
In a Pokemon Ash turns evil fanfiction, he might start using his Pokemon for wrong purposes. For example, instead of battling for sport and friendship, he could use them to steal from other trainers or take over Pokemon Centers. His Pikachu, usually so loyal, might be conflicted about following his new, evil ways.
A lot could change. His fashion sense might be completely different. Instead of his usual cap and jacket, he could be wearing more feminine outfits. His Pokémon might need to get used to this new look too. Pikachu might be a bit confused at first but then adapt. Also, Ash's rivals might not take him as seriously at first when he's a girl, but he could prove them wrong with his skills.