Perhaps they get involved in a local Alola Pokemon festival. There, they participate in various Pokemon - related contests and meet new characters. Anabel's psychic powers could give them an edge in some of the more challenging events. And Ash's determination would keep them going even when the odds are against them.
Ash and Anabel could go on a Pokemon-catching spree in Alola. They might compete to see who can catch the rarest Pokemon first.
In this fanfiction, it's possible that Anabel has some sort of connection to an ancient Alola legend. Ash, being the curious and adventurous type, would be eager to help her uncover the truth. Along the way, they face many obstacles, like ancient Pokemon guardians that they have to defeat or puzzles they need to solve to progress in their quest.
One aspect could be the development of their relationship. Ash is always making friends, and with Anabel in Alola, they might have a special bond. They could learn from each other, like Ash teaching Anabel some of his unorthodox battle tactics, and Anabel showing Ash more about the mysterious aspects of Pokemon in Alola.
Ash could discover a new form of an existing Alola Pokemon. This new form could be the result of some kind of special evolution due to the unique energy in the Alola region. His friends would be amazed, and they would all help him research and understand this new discovery.
In this kind of fanfiction, they might have new adventures. They could explore the unique Alola region together, encounter new Pokemon species, and bond even more deeply. Maybe Serena would learn new battle strategies from Ash, and they would participate in local Alola Pokemon contests and battles side by side.
Ash might have a rematch with a previous tough opponent in the Alola League and finally defeat them. His Pokémon's teamwork could be the key factor. For instance, his Alola team could combine their moves in a unique way to overpower the foe.
There could be a lot of cute and fun moments. Maybe Ash tries to cook for his harem using Alola's local ingredients with Mallow's help. And there would be some jealousy and competition among the girls in a light - hearted way. They all want Ash's attention, but in the end, they also become good friends. The fanfiction could also include some Pokémon battles where Ash's harem members cheer him on, adding more excitement to the story.
Maybe they'll go on an adventure together in Alola. Red could be amazed by the unique Pokémon species in Alola, and Ash could learn from Red's experiences with Pokémon from other regions. They might also team up to face some tough opponents and show off their combined skills in Pokémon battles.
In this fanfiction, Ash might make new friends in the Alola region. He could encounter unique Pokémon there that he has never seen before, like the Alola forms of some Pokémon.
In the fanfiction, they may decide to explore uncharted regions. With their combined knowledge and skills, they would be a formidable team. Along the way, they could discover new Pokémon species and form alliances with local Pokémon trainers. Their marriage would be strengthened by these shared adventures, and they would become legends in the Pokémon world for their discoveries and contributions.
Well, perhaps Greninja will encounter some new and strange Pokémon in Alola that it has never seen before. Ash could use this opportunity to train Greninja further, and they might participate in some Alola - specific Pokémon contests or battles together. Greninja's presence could also stir up some friendly rivalries among the local Pokémon and trainers, leading to exciting adventures and growth for both Ash and Greninja.
A common theme in such fanfictions could be Ash's adventures in Alola while building relationships with different characters. Maybe he forms special bonds with his Pokémon and the people around him in a more romantic or friendship - deepening way.