It could start with the boy having a really strong wish to be a Pikachu. His intense desire somehow triggers a magical event that turns him into one. Once he's a Pikachu, he discovers that the Pokémon world is not as simple as he thought. He has to face challenges like avoiding being caught by Pokémon trainers and finding food suitable for a Pikachu in the wild.
Well, it could start with Ash being transformed into a Pikachu in a mysterious forest. His friends are initially confused but soon realize it's him. As a Pikachu, Ash discovers new abilities he didn't know about before. He might be able to sense things like incoming danger more acutely. He could also have a hard time convincing his other Pokémon that he is still their trainer. Throughout the fanfiction, there could be a series of comical and exciting events as he tries to adapt to his new form and find a way to reverse the transformation.
One possible plot could be that Ash turns into Pikachu and has to learn how to communicate with his human friends in this new form. He might struggle at first, but then discovers that he can use his Pikachu abilities in unique ways to help the group in battles and in solving problems around them.
One possible plot could be Pikachu getting influenced by a dark and powerful Pokemon. For example, a Darkrai might use its nightmare - inducing powers on Pikachu. This could make Pikachu start to attack other Pokemon and trainers without mercy. Maybe Pikachu would first target its own trainer, Ash, as it would be the most shocking turn of events. This would create a lot of chaos in the Pokemon world and force Ash and his other Pokemon friends to try and figure out how to save Pikachu from this evil state.
Well, it could be about a scientific experiment gone wrong. A boy volunteers for an experiment that is supposed to enhance human abilities. But instead, there is a malfunction in the machinery or chemicals used. This causes his genetic makeup to change, and he turns into a girl. He then has to deal with his new identity, his family's reaction, and his own feelings about this sudden transformation.
One possible plot could be that a young boy stumbles upon an enchanted amulet. When he puts it on, a magical spell is cast and he slowly transforms into a girl. He then has to navigate a world that now sees him as a girl, facing new challenges and making new friends along the way.
He might start by getting used to his new physical abilities. Since Pikachu is an electric - type, he'd need to learn how to control his electric shocks. For example, not accidentally shocking his friends or family.
Pikachu might find it difficult to communicate at first. Since it was used to making 'Pika - pika' sounds, it would have to learn human languages. It could start with simple words and phrases, and as it becomes more proficient, be able to have complex conversations. For example, it might try to explain to Ash how strange it feels to have fingers instead of paws.
A Pikachu love story could start with two Pikachu meeting by chance in a thunderstorm. They take shelter under a big leaf together. After that, they keep meeting at the same spot every day, gradually falling in love as they share their experiences of finding food and avoiding predators.
Well, perhaps the mom has some psychological issues herself. She could think that turning the boy into a little girl would be 'cute' or something. She might start by making the boy wear pink dresses, use girl - themed accessories, and force him to participate in activities that are more associated with girls. However, this kind of behavior is not acceptable in a normal and healthy society as it violates the boy's own identity and rights.
One possible plot could be that the black man, perhaps through a series of strict and gender - role - challenging tasks, tries to change the boy's behavior. For example, he might introduce the boy to activities like sewing or ballet which are often stereotyped as 'feminine'.