One idea could be a story about a trainer who discovers a rare and powerful Pokemon that was thought to be extinct in the Alola region. This Pokemon could have unique abilities that attract the attention of both good and bad characters in the fanfiction.
One idea could be that Naruto and his friends are transported to the Alola region in the Pokemon Sun and Moon world. There, they discover new Pokemon and learn about the unique Z - Moves. Naruto might befriend a Rowlet because of its small and cute appearance but also its determination, much like himself. He could train with it and enter Pokemon battles using his ninja skills to strategize.
One idea could be Guzma's backstory exploration. Maybe he had a difficult childhood that led him to form Team Skull. Another plot could involve a friendship between Guzma and a new trainer in Alola. They start off as rivals but gradually become friends and learn from each other.
Well, perhaps Serena could get involved in a mystery regarding a rare and powerful Pokemon in Sun and Moon. She could team up with some local trainers to solve it. Maybe there's a hidden cave where this Pokemon is rumored to be, and along the way, she discovers new forms of Pokemon she's never seen before. This would add an element of adventure to the fanfiction.
One idea could be a trainer from the Sun region traveling to the Moon region and having to adapt to the different Pokemon species and cultural differences there. For example, they might be shocked by the unique Z - Moves in the Moon region. Another could be a group of Pokemon from both regions coming together to stop an evil force that threatens both their lands. Maybe a dark organization is trying to capture rare Pokemon from both areas for their own sinister purposes.
One idea could be that Greninja returns with a new power that it gained during its time away. It could use this power to help Ash in a crucial battle in the Alola region. For example, it might have learned to control water in a more unique way, like creating ice sculptures that can attack opponents.
One interesting plot idea could be that the main character swaps bodies with their Pokemon. They then have to figure out how to communicate with their trainer friends and battle in the Pokemon's body. Another idea is that two rival trainers swap bodies and through this experience, they come to understand each other's motives and struggles better. A third idea could be a body swap between a legendary Pokemon and a regular trainer, leading to chaos as the trainer tries to handle the power and responsibilities of the legendary while the legendary tries to adapt to the human world.
One interesting plot idea could be a story where Gladion and Lillie have to team up to rescue a rare and endangered Pokemon. They might face various challenges along the way, like dealing with Team Skull. Another idea is a time - travel plot where they go back in time to learn more about their family's past and how it relates to the Pokemon world. Or perhaps a story where they are separated in a different dimension and have to find their way back to each other while making new Pokemon friends and allies.
One interesting plot idea could be Ash and Lillie going on a special mission together to find a rare and powerful Pokemon that has the ability to heal other Pokemon. They face many challenges along the way, like rough terrains and other trainers who also want to capture this Pokemon. Another could be a story where Lillie gets lost in an unknown part of the Alola region and Ash has to use all his skills and knowledge to find her. During this time, he discovers more about Lillie's past and the secrets she has been hiding.
One idea could be an OC who is a trainer from a far - off region coming to Alola. They could have a unique Pokemon not native to Alola and struggle to adapt to the new battle styles and cultures. For example, their Pokemon might be used to colder climates and have trouble with the heat in Alola.
One idea could be that the main character is a new student at the high school in the Alola region. They discover a secret Pokémon club where students train their Pokémon for unique battles. Another could be a story about a rivalry between two students over who will be the top Pokémon trainer in the school. Maybe one has a team of Sun - based Pokémon and the other of Moon - based Pokémon.