If Meowth joins Ash in fanfiction, it could lead to some really interesting character dynamics. Meowth has been part of Team Rocket for a long time, so there would be a lot of room for him to change and grow. He could teach Ash some of the sneaky tricks he learned from Team Rocket, but in a more positive way. Maybe they'd form a new team and compete in different Pokémon competitions.
One possible storyline could be that Meowth helps Ash find a rare Pokémon. Since Meowth has his own network among Pokémon, he might hear rumors about a very special Pokémon. He then takes Ash to the location, and they have an epic adventure trying to catch it. Another storyline could be that Meowth and Ash team up to take down a new evil organization that's causing trouble in the Pokémon world.
Meowth joining Ash in a fanfiction could also lead to some interesting character development for both. Ash might learn more about the Pokémon world from Meowth's perspective, especially the seedy side that Meowth has been a part of with Team Rocket. And Meowth could learn about friendship and loyalty in a new way, different from what he's experienced with Jessie and James.
The storyline would likely become more complex. With Meowth around, there would be a new dynamic. His loyalty would be split between Ash and his old Team Rocket pals at first. This internal conflict could drive parts of the story.
In this fanfic, the plot could be that Meowth has a change of heart after an encounter with a powerful and kind Pokémon that Ash helps. This makes Meowth realize that Ash's way of treating Pokémon is better. So, he joins Ash. He could then use his unique skills, like his ability to talk, to help Ash in battles and communicate with other Pokémon more effectively.
His personality might become more positive. Instead of being a bit of a schemer like he was with Team Rocket, he could become more helpful and honest. He might start to care more about others' feelings.
A great 'ash and meowth fanfiction' often has a strong emotional connection between the two characters. It might show their mutual respect growing over time. For example, they could start as enemies but gradually become friends. Also, an interesting plot that takes them out of their comfort zones, like exploring a new region or facing a powerful new enemy.
Well, in the fanfiction, perhaps Ash catches Meowth to try and reform it. He might see that Meowth is not really a bad Pokémon at heart, just following the wrong crowd in Team Rocket. So he takes it under his wing, and they start to develop an unlikely friendship which changes both of them for the better.
One popular 'ash and meowth fanfiction' is 'The Unlikely Bond'. It explores a unique friendship between them outside of their usual rivalry. Another is 'Ash and Meowth's Adventure Beyond', which takes them on an exciting journey through uncharted regions. There's also 'Meowth's Redemption in Ash's Eyes' that delves into how Meowth could find a new path with Ash's influence.
It could be about Ash from the Pokémon series catching Meowth. Maybe it focuses on the adventure during the catch, like the strategies Ash uses or the challenges he faces in trying to catch that sneaky Meowth.