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.
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.
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.
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.
Ash could be a Pokémon trainer with a different starting point in this fanfiction. Born in 1987, by 1997 he might have already made a name for himself in local Pokémon battles. He could have a team of Pokémon that he rescued from difficult situations, like a Charmander that was abandoned by its trainer. His story could revolve around giving these Pokémon a second chance and proving that Pokémon don't need to be 'perfect' to be strong.
One popular aspect of Alola fanfiction with Ash could be his growth as a trainer. In the Alola region, Ash had unique experiences. Fanfiction might explore how he further developed his skills, formed new bonds with Pokemon, and interacted with the local culture. For example, his relationship with Pikachu might be delved into deeper, showing how they overcame new challenges together in the Alola setting.
One popular Ash and Ash - Greninja fanfiction could be those that focus on their adventures in a new, unexplored region. In these stories, they might face unique and powerful Pokémon, strengthening their bond along the way.
In a fanfiction about Ash born in 1987 and his situation in 1997, we could see an alternate story where Ash is not the typical rookie trainer. Since he's a bit older than in the original, he might be more knowledgeable about Pokémon lore. He could be on a quest to uncover some ancient Pokémon secrets in 1997. He might travel to different regions, not just for battles but also to study old Pokémon texts and artifacts, and along the way, form an unusual team of Pokémon that are attracted to his in - depth knowledge.
Perhaps it would be a combination of forces that save Ash. His own Pokémon, led by Pikachu, could start the rescue mission. Along the way, they might encounter some friendly Pokémon trainers who offer their help. And there could also be some unexpected help from a Pokémon that Mew least expects. This Pokémon could have some sort of connection to Mew and be able to convince it to let Ash go or help Ash escape while Mew is distracted.
One great aspect of Aura Guardian Ash fanfiction could be the exploration of Ash's latent aura powers. Maybe in these stories, Ash discovers he has a much deeper connection to the aura realm than he ever knew. This could lead to him having new abilities and forming unique bonds with Pokémon that are also attuned to the aura.