Another aspect could be Ash's growth as a person. Through his relationships with the girls in his harem, he learns more about himself and his feelings. He might become more confident in expressing his emotions. Also, the fanfiction could explore how the different cultures in Alola affect the relationships. For example, a local Alola festival could be the setting for a group date or a big gathering where Ash and his harem have a great time together.
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.
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.
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 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, 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.
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.
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.
Some fanfictions in this category have the theme of self - discovery. Ash, for example, might discover new aspects of himself through his relationships with the harem members. The theme of loyalty also pops up. The members of the harem are often shown to be loyal to Ash and vice versa. Additionally, there can be a theme of competition. Maybe there are friendly rivalries between the harem members in terms of who can be the best Pokemon trainer or who can help Ash the most, which adds an interesting dynamic to the stories.
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.
One great 'Pokemon Ash Alola' fanfiction is 'Ash's Alolan Adventure'. It has Ash making unique friendships in Alola and facing new Pokemon challenges. The story really captures the essence of the Alola region with its beautiful descriptions.