It could be about a group of mean characters in the Pokemon world. Maybe they form a team and cause trouble for the main characters. For example, they might steal Pokemon or disrupt Pokemon battles.
One possible plot could be that the Pokemon Team Hypno is on a quest to find a legendary Pokemon. Hypno's psychic powers are used to sense the location of this rare Pokemon. They face many obstacles like other rival teams who also want to find the legendary Pokemon first.
In a Pokemon Red join Team Rocket fanfic, the main character could be a disillusioned trainer. Maybe they've lost a few too many battles and are looking for a new way to gain an edge. Team Rocket seems like an alluring option. They join up and are immediately thrust into the world of illegal Pokemon trading. However, they soon meet a friendly Pokemon that shows them kindness despite their new allegiance. This makes them question their decision to join Team Rocket and they start to think about how they can use their new position to actually help the Pokemon instead of harming them.
Pikachu would likely be very confused and resistant. Pikachu has a strong bond with Ash and knows his true nature. It would probably try to shock Ash out of whatever trance or false belief he has from joining Team Galactic. For example, when Ash starts to follow Team Galactic's orders that go against his usual principles, Pikachu might refuse to cooperate and try to show Ash that he's on the wrong path.
Misty's Pokemon could be involved in a way where they are all captured by Team Rocket. Then Misty has to rely on her wits and some basic Pokemon - handling skills without her actual Pokemon. She has to find a way to free them. Meanwhile, her Pokemon are trying to communicate with other wild Pokemon in Team Rocket's base to create a sort of uprising. This would lead to a big showdown where Misty and her freed Pokemon take on Team Rocket and their own captured Pokemon.
Well, a fanfic about Pokemon Mystery Dungeon Team Go - Getters can offer a fresh perspective on the Pokemon world. It might introduce new plotlines or expand on the existing ones. For example, it could show how the team members overcome their individual weaknesses through their combined efforts in the mystery dungeons.
Well, if Ash joins Team Rocket in a fanfic, it would be a huge shift in the Pokemon world. His friends, like Misty and Brock, would be shocked. They might try to rescue him. Ash, on the other hand, could initially be attracted to the idea of a new adventure with Team Rocket. He could see them as underdogs in a way, always failing but still trying. But as time goes on, he'd start to see the problems with their way of doing things.
One possible plot could be that Misty gets captured by Team Rocket. They plan to use her as a bargaining chip against Ash. But during her captivity, she manages to befriend some of the lower - level Team Rocket grunts. These grunts start to have second thoughts about their evil deeds because of Misty's influence. Eventually, Misty uses this new - found friendship to escape and also cause some internal chaos within Team Rocket.
Well, it might focus on the individual members of the Pokemon Team Hypno. Each member could have their own backstory, goals, and relationships within the team. For example, one member might have joined the team because they were saved by Hypno in the past. And they could be on a mission to prove the power and worth of Hypno - based teams in the Pokemon community. They could also be involved in some sort of mystery or quest that only Hypno's psychic powers can help them solve.