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.
One possible plot for a fanfic where Ash joins Team Rocket could be that there's a powerful and mysterious Pokémon that only Team Rocket knows how to find. Ash, desperate to catch this Pokémon, makes a deal with them to join. However, once he's part of the team, he discovers that their methods are far more cruel than he expected. He then has to battle his own conscience as well as the other members of Team Rocket to either stop their plan or find a more ethical way to catch the Pokémon.
One potential consequence is that it would damage her relationships with her former friends. Ash and Brock would be very disappointed in her. Also, the Pokémon she had would be in a difficult situation. They might not be used to the unethical ways of Team Rocket. Another consequence could be that the balance of power in the Pokémon world would shift slightly. Team Rocket would gain a more competent member, which could make them more of a threat to other trainers and Pokémon centers.
Well, the plot might start with a trainer who is a bit of a rebel. They don't like following the normal rules of the Pokemon world. Team Rocket notices this and recruits them. As part of Team Rocket, they participate in raids on Pokemon Centers to steal medicine for their own Pokemon. However, during one of these raids, they encounter a very sick Pokemon that needs that medicine desperately. This makes them question Team Rocket's motives. They then start to secretly work against Team Rocket from within, trying to protect the Pokemon and the integrity of the Pokemon world.
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.
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.
Ash joining Team Rocket could lead to some interesting character dynamics. He might start to question his own values. For instance, he's always been about friendship with Pokemon, but Team Rocket is more about using them for gain. This internal conflict could be a major part of the fanfic. Also, his relationship with Jessie, James, and Meowth would change drastically.
One common theme is power and control. Team Rocket often tries to brainwash Pokemon or trainers to gain an upper hand in the Pokemon world. Another theme could be redemption. Sometimes the brainwashed characters find a way to break free and redeem themselves. Also, the struggle between good and evil is prominent. The heroes try to stop Team Rocket's brainwashing plans and restore peace.
The main characters might not only be human trainers. Some Pokemon could take on leading roles. For example, a powerful and wise Charizard could be a main character. It might have been trained by a famous trainer in the past but now fights independently against Team Rocket. There could also be a group of Eeveelutions that are the main focus. They have different abilities and personalities, and together they form a force to be reckoned with against Team Rocket. Alongside them, there could be a trainer who acts as a guide or coordinator for their efforts.
Maybe there's a rogue Pokemon trainer. This trainer is jealous of Dawn's skills and the attention she gets. When Dawn joins Team Rocket, this trainer sees it as a chance to expose her as a fraud. He or she then tries to stop Dawn and Team Rocket's activities, thinking that they are up to no good, which they are, but the trainer has his own self - centered motives.