Another role could be as a test subject for Team Rocket's experiments. They might be trying to find a way to control Pokémon more effectively or to create new types of Pokémon. As a Pokémon, Ash would be at the mercy of their experiments, and his struggle to break free and return to his human form could be a major part of the fanfiction story.
One possible role is that he could be a spy. Since he was turned into a Pokémon, Team Rocket might not suspect his true identity and he could gather information about their evil plans. For example, he could overhear conversations between Team Rocket members that he couldn't have accessed as a human.
Yes, in some Team Rocket fanfictions, Ash can be depicted in various ways that might involve him having some sort of connection to Pokémon in a different light. Maybe he could be experimented on by Team Rocket to gain Pokémon - like abilities, or be transformed into a Pokémon - like being in a very creative and out - of - the - box fanfiction concept.
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.
His Pokémon would probably be very confused at first. Pikachu, for example, might try to zap Ash back to his senses if he starts acting like a Team Rocket member. They would likely sense that something is wrong with Ash and would do their best to get him away from Team Rocket's influence.
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.
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.
Well, Ash's Pokémon are a diverse bunch. His Heracross could use its Horn Attack to directly combat Team Rocket's Pokémon. Totodile could use its playful nature to confuse Team Rocket's Pokémon. And Ash's Bayleef could use its Razor Leaf to cut through any ropes or barriers that Team Rocket has set up to restrain Dawn. All of his Pokémon, with their unique abilities, would work together under Ash's command to save Dawn from Team Rocket.
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 possible motive could be that Team Rocket has constantly been causing trouble for Ash and his friends. They've been trying to steal his Pokémon time and time again, which might have finally pushed Ash over the edge.
The Pokémon League would be in shock. They would see Ash and Misty as traitors and would probably send out teams to capture them. Pokémon trainers who looked up to Ash would be very disappointed. They might start to question their own values and the values of the Pokémon training world.