ash turns into a girl

I'm not sure which specific 'ash turns into a girl' story you are referring to. There could be various fictional or creative interpretations. Maybe it's a magical transformation where Ash, perhaps a character from a particular universe, is under a spell or has some special encounter that causes the change. Without more context, it's difficult to tell the exact story.

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.

Well, perhaps in the fanfiction, Ash is exposed to a mysterious Pokémon's special ability that causes the transformation. As a girl, Ash discovers new aspects of himself. He might find that some Pokémon are more attracted to his new form and are more willing to be caught or trained. He could also use this new identity to his advantage in battles, like using the element of surprise against opponents who are used to facing the male Ash.

Well, perhaps in the fanfic, Ash turns into a girl because of a curse. As a girl, Ash could start to see the Pokemon world from a different perspective. Maybe she would form new relationships with her friends, like Pikachu being more protective. And she might have to enter Pokemon contests instead of battles at first due to the new appearance, but then find a way to get back into battles and show that she's still the same strong trainer inside.

Maybe Team Rocket could be the main antagonist. They might see Ash's transformation as an opportunity to finally capture Pikachu. Since Ash is in a more vulnerable state as a girl, they could try to use different tactics to take advantage of the situation.

It could be due to a curse. Maybe someone with malicious intent put a curse on Ash that turned him into a girl.

One possible theme could be identity. Ash, now as a girl, would have to re - evaluate who he/she is. Another theme might be relationships. His/her relationships with Gary and other characters would likely change in interesting ways.

Well, perhaps it could be about Ash getting cursed by Erica and then turning into a girl. And then he - or now she - has to deal with all the changes in her life, like how people around her react differently. Maybe she has to adapt to new social situations and new relationships all while trying to find a way to turn back.

It could be a jealous trainer who doesn't like the attention that girl - Ash is getting. This trainer might try to undermine her at every turn during Pokemon battles.

I'm not sure of specific 'Gary turns Ash into a girl' fanfictions. You can try searching on fanfiction - specific websites like FanFiction.net or Archive of Our Own. Just use those keywords in their search bars and you might find some interesting works.