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.
Lyra might also be used as a tool to explore the backstories of Team Rocket members. By interacting with them, she could uncover secrets and past traumas that led them to join Team Rocket in the first place. This can add depth to the fan fiction and make the characters more relatable.
Well, in many Team Rocket fan fictions, Lyra can be depicted in various ways. She could be a new recruit who is initially naive about Team Rocket's true intentions. Maybe she joins thinking it's all about adventure and then discovers the darker side.
There are fanfictions where Team Rocket actually turns good. They might start helping Ash and his friends instead of causing trouble. This kind of story often has a lot of character development for the Team Rocket members as they learn new values.
Another plotline might involve Ash teaming up with some of the Team Rocket members, perhaps reluctantly at first. They could be forced to work together due to a common threat to both the good guys and the bad guys in the Pokemon universe. This would lead to some interesting character developments for Ash as he has to deal with the not - so - good nature of Team Rocket.
In a fanfiction where Ash joins Team Rocket, it could lead to some really interesting storylines. Ash has a lot of knowledge about Pokémon training that Team Rocket lacks. He could potentially teach them new techniques, but at the same time, his moral compass would be constantly at odds with their devious ways. Maybe he joins them because he's somehow tricked or he has his own secret plan to take them down from the inside. It would be a great opportunity to explore different aspects of his character and how he adapts to this new situation.
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.