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.
The other Pokemon in the Pokemon Center where Pikachu is usually treated would be very frightened. Nurse Joy would be at a loss as to what to do, as she has never seen Pikachu act this way. Professor Oak would be extremely concerned and would start researching immediately to find out what could have caused this sudden change in Pikachu. Team Rocket, on the other hand, might initially see this as an opportunity to capture Pikachu more easily, but they would soon realize that an evil Pikachu is far more dangerous than they expected and might end up getting in over their heads.
Well, it depends on the specific fanfic. Some might have a plot where Evil Pikachu teams up with other dark - type Pokémon to take over a region. It could involve battles against the traditional Pokémon heroes.
Well, if Ash turns into a Pikachu in a fanfiction, it would be quite a transformation. Firstly, his communication with Pikachu would become more of an internal dialogue. And he'd have to get used to moving around on all fours and using Pikachu - like movements. His battles would be completely different too. He'd be relying on Pikachu's natural skills rather than his own battle strategies as a human trainer.
Obviously, Evil Pikachu is a main character. There might also be trainers who are trying to either stop it or control it. Maybe some other Pokémon that are allied with or against the Evil Pikachu could also be considered main characters.
Team Rocket could still be the main antagonists. They might see Ash as a Pikachu and try to capture him more than ever, thinking he's a special Pikachu. Maybe they believe he has some sort of new power because of his transformation.
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, a fanfic about Pikachu and Porygon can be charming because of their contrasting natures. Pikachu is this cute, furry, and very physical Pokemon. Porygon, in contrast, is a digital entity. In a fanfic, their differences can lead to many comical situations. For instance, Pikachu might get confused when Porygon does something like disappearing into a digital portal suddenly.
Well, first of all, it's not in line with the moral and ethical standards of the Pokemon world. The Pokemon series has always promoted positive values like friendship and perseverance. Mating - related fanfics are completely off - track and can also have a negative impact on the brand image of Pokemon.
A fanfic involving Pikachu and Porygon might focus on their friendship. Pikachu, being the more outgoing and energetic one, could introduce Porygon to the joys of playing in the grass and chasing butterflies. Porygon, on the other hand, could show Pikachu the amazing digital landscapes it can access. Their friendship could grow as they learn from each other's worlds, and together they could face challenges like an evil Team Rocket plot to capture both of them.