In Paldea, the interactions could change because of the different cultures and Pokemon battles. For example, if there are new battle styles in Paldea, Ash would be eager to learn and participate. Team Rocket might try to disrupt these battles to steal Pokemon. But as they interact more, they could start to understand each other better. Ash could see that Team Rocket might be more desperate for success in this new region, and Team Rocket could see Ash's determination to adapt and grow.
One possible plotline could be that Ash and Team Rocket accidentally team up in Paldea to face a common enemy. Maybe there's a powerful and mysterious Pokemon in Paldea that's causing chaos and they realize they need to combine their efforts to stop it. Ash could bring his skills and positive attitude, while Team Rocket could use their sneaky tactics in a good way for once.
One idea could be that Ash and Dawn visit Paldea for a special Pokemon exchange event. They meet new Pokemon and trainers, and Ash gets into some friendly battles with the local champions. Dawn, on the other hand, discovers new forms of Pokemon contests in Paldea and decides to participate.
The plot could revolve around Ash and Dawn being chosen to represent their home regions in a big Paldean Pokemon tournament. They train hard together, learning new techniques from Paldean trainers. However, they soon discover that there is a conspiracy to rig the tournament, and they have to expose the plot while still competing.
He might become more cautious. Usually, Ash is quite bold and rushes into things. But if he's in a Team Rocket - centered fanfiction, he'd likely be more careful as he's constantly surrounded by danger. For example, he'd think twice before challenging a new Pokemon or entering an unknown area.
Pikachu would probably be very confused at first. It's used to fighting against Team Rocket, not being on their side. It might resist and try to zap Ash to snap him out of it.
It would also have an impact on the other villainous teams in the Pokémon world. They might see Ash joining Team Rocket as a sign that they can also recruit more powerful trainers. This could lead to more alliances between the bad guys and more complex plots to steal Pokémon and cause trouble all around the Pokémon world.
The Pokémon League might condemn Ash's actions. Despite Team Rocket's wrongdoings, killing is not an acceptable solution in the Pokémon world which values friendship and co - existence. Ash could face consequences such as being banned from Pokémon battles or certain areas. On the other hand, some trainers who have been harassed by Team Rocket for a long time might secretly support Ash.
The plot could revolve around Ash's initial confusion and conflict. He might join Team Rocket thinking he can change them, but soon realizes it's not that easy. His loyalty to his old friends would be tested as he gets drawn deeper into Team Rocket's plans.
One thing that would happen is that his Pokémon battles would take on a whole new meaning. Instead of battling for the sake of becoming a Pokémon master, he might be battling to further Team Rocket's goals. His Pokémon would have to adjust to this new purpose. Also, Ash would probably have to wear Team Rocket's uniform, which would be a really strange sight for fans who are used to seeing him in his normal get - up.
It could lead to some really unexpected and exciting plot twists. Ash's alignment with Team Rocket would completely change the dynamics of the story.