A possible scenario is that the girl has a dream of becoming a Pokemon master like Ash. She follows him around to learn from him. Along the journey, they encounter a powerful and mysterious Pokemon that neither of them has seen before. They have to work together, combining their Pokemon's abilities to defeat it or at least understand it better.
The girl might be a Pokemon researcher. She meets Ash and is initially skeptical of his unorthodox training methods. But as they travel together, she sees how effective his bond with his Pokemon is. They could end up sharing their knowledge and helping each other grow as Pokemon enthusiasts.
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.
In 'pokemon ash saved by pokemon fanfiction', it's possible that Ash gets into a situation where he's lost in an unknown and dangerous area. The Pokemon fanfiction might have his favorite Pokemon, like Pikachu, using some unexpected abilities or getting help from other friendly Pokemon to save Ash. For example, Pikachu could team up with a group of local Pokemon who know the area well and they guide Ash out of danger while also protecting him from any threats along the way.
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.
In the 'pokemon ash in the hospital fanfiction', it could be that Ash got poisoned during an encounter with a new and dangerous Pokémon. While in the hospital, he starts to have strange dreams about a powerful Pokémon he has never seen before. His friends come to visit him, like Misty and Brock. Misty might scold him a bit for being too reckless but also show her concern. Brock could be using his knowledge of herbs to see if there are any that can help Ash's recovery. And all the while, Ash is thinking about getting back on his journey as soon as possible.
Perhaps Salamence gets injured and Ash has to nurse it back to health. During this time, they form a strong bond. Later, Salamence helps Ash in a crucial battle against a powerful villain in the Pokemon world. This would show the power of friendship between Ash and Salamence.
In such a fanfiction, Ash might become extremely isolated. He could lose faith in his Pokémon and himself. Maybe he'd leave the Pokémon world in despair, feeling that all his efforts were in vain. Without the support of his friends and Pokémon, his once - strong will to be a Pokémon Master could crumble completely.
If Ash adopts a child, the child could become friends with all of Ash's Pokemon pals. Pikachu could become like a big brother or protector to the child. Ash would have to balance his Pokemon training with taking care of the child. He might teach the child how to train Pokemon in a more gentle and understanding way, which could lead to new training techniques in the fanfiction.
Ash could discover a new form of an existing Alola Pokemon. This new form could be the result of some kind of special evolution due to the unique energy in the Alola region. His friends would be amazed, and they would all help him research and understand this new discovery.
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.
In this fanfiction, they may face a new villainous team in Unova. This team could be causing trouble for the local Pokemon and trainers. Ash and Dawn would have to use their combined skills to stop them. Ash's battle skills and Dawn's ability to think on her feet during Contests would be valuable assets.