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.
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.
The Pokémon might initially think it's some sort of joke or mistake. But as time goes on, if Ash seems serious about being with Team Rocket, they could become divided. Some of the more headstrong Pokémon might leave Ash, while others might stay with him out of loyalty but still be unhappy about the situation. They would be constantly trying to nudge Ash back to his old ways of being a good Pokémon trainer.
His Pokémon might be confused at first. They are used to Ash being on the side of good. But if Ash believes he can change Team Flare for the better, his Pokémon might go along with it. However, they could also sense the danger and be on high alert. For instance, Pikachu's electric attacks might be more charged up than usual, ready to protect Ash at any moment.
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.
Ash's character might become more conflicted. He has always been the hero, fighting against Team Rocket. But now, being part of them, he would question his own values. He might initially try to change Team Rocket from the inside, but as he faces more and more of their evil deeds, he would struggle between his loyalty to his new 'team' (out of a sense of obligation since he joined) and his true nature of being a Pokémon protector. Misty, on the other hand, would probably be more outspoken about her dislike for Team Rocket's actions and try to convince Ash to leave sooner.
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.
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.
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.
Well, first of all, the perception of Team Rocket in the Pokémon world would change drastically. People would be confused and worried about Ash leading them. In terms of Pokémon - related activities, Ash could introduce new training methods to Team Rocket members. This might make their captured Pokémon stronger and more difficult to defeat for other trainers. Also, Ash could use his influence to make Team Rocket more involved in Pokémon conservation in a strange way. For instance, he might steal Pokémon from trainers who are not taking proper care of them and then place them in better environments. This would create a whole new set of rules and power dynamics in the Pokémon world, as other organizations and trainers would have to adjust to this new Team Rocket.