One idea could be that Ash discovers a new type of Pokémon evolution that is unique to the Alola region. He then tries to understand how it works and if he can help other Pokémon evolve in the same way. Another idea is that Ash gets lost in an ancient Alola forest and has to find his way out with the help of some new and strange Pokémon he meets there.
In an Ash's Alola journey fanfiction, Ash could be involved in a time - travel adventure. He somehow gets sent back in time to the early days of the Alola region. There, he witnesses how the first Pokémon trainers in Alola started their journey. He learns from them and brings back some ancient Pokémon training techniques to the present day in Alola.
A fanfiction idea could be that Ash is invited to a secret Pokémon sanctuary in Alola. It's a place filled with rare and endangered Pokémon. Ash has to protect the sanctuary from poachers who are after the valuable Pokémon. He teams up with the local Pokémon rangers and uses his skills and the power of his Pokémon to fend off the bad guys and save the sanctuary.
Ash's Alola journey was filled with amazing adventures. He made new friends like Pikachu and the Alola gang. In my fanfiction, Ash discovers a hidden cave filled with rare Pokémon. He has to use his wits and the skills he learned in Alola to navigate through it. It's a thrilling adventure as he faces challenges and tries to catch the Pokémon inside.
In a fanfiction about Ash's reunion in Alola, perhaps he comes back to help with an ecological problem. The Alola region's unique ecosystem is in danger, and his friends call him for his expertise. Ash brings along some of his other Pokemon from his travels, and together they work to save the day while also having a great time catching up.
A great fanfiction idea could be Ash having to defend his championship title against a mysterious trainer from another region. This trainer has a unique set of Pokémon and a very different battle style from what Ash is used to in Alola. It would test Ash's skills and his ability to adapt as a champion.
One idea could be that Ash's victory in the Alola League is due to his strong bond with his Pokémon. His Pikachu, for example, could have evolved a new move during the final battle that gave them the edge. Another idea is that Ash's experience from all his previous regions finally culminates in this victory, and he uses strategies he learned along the way.
Another idea is that May decides to study Pokémon in Alola for a research project. Ash joins her to help. They visit different islands in Alola and encounter unique Pokémon training styles. They also face a group of poachers who are trying to steal some of the Alola Pokémon. Ash and May must use their skills and the help of their Pokémon friends to stop the poachers and protect the Alola Pokémon.
Perhaps there could be a plot where Charizard accidentally causes a wildfire in Alola. Ash then has to take responsibility and with the help of the local Pokémon and trainers, they work together to put out the fire and repair the damage. This would show the importance of environmental protection and how Ash and Charizard learn from their mistakes in a new region.
One idea could be that Ash and his Pokémon team up with each of the girls in the Alola harem to compete in a special tournament. They train together, share their Pokémon training techniques, and during this process, their relationships deepen.
A great plot could involve Ash competing in a local Alola tournament that has some really strange and unique rules. This would force him to think outside the box and use different battle strategies. He might also make some new friends or rivals during this tournament who have their own interesting stories and Pokémon.
Perhaps in the fanfiction, Ash and Serena could stumble upon a mysterious Alola Pokémon that is said to have the power to grant wishes. They then go on an adventure to find this Pokémon, while also exploring the beautiful and diverse regions of Alola. During their journey, they help local Pokémon trainers with their problems and learn more about the Alola culture.
In the fanfiction, Alola Lily could be a Pokémon researcher. Ash visits her research center and they start working on a project together, like studying the evolution of a certain Alola Pokémon. As they spend long hours observing and documenting, they start to have deeper conversations. They discover they both have a passion for understanding Pokémon better, and this common ground leads to a romantic relationship. Their love might be tested when Ash has to leave for another region for a Pokémon tournament, but they find ways to stay connected.