Ash might become friends with some of the Sinnoh gym leaders outside of the context of battles. For example, Gardenia, the Eterna City gym leader. She has a love for nature and Pokémon, and Ash, with his own love for Pokémon, could bond with her over that. There could also be some local trainers that Ash meets during his travels who share his passion for Pokémon and become his friends.
He could make friends with Dawn. She's a well - known character in Sinnoh and her knowledge of Pokémon contests could be really helpful to Ash. Another potential friend could be Barry. His energetic and competitive nature would make for some interesting interactions with Ash.
Ash could make friends with local Pokémon researchers in Rota. They might share their knowledge about Pokémon behavior native to the area with him.
He might meet some local Sinnoh trainers who are experts in training specific types of Pokémon, like a trainer who specializes in ice - type Pokémon in the colder regions of Sinnoh.
Gary could be one of his rivals. Gary has always been competitive with Ash. Another potential rival could be a new character introduced in the fanfiction, someone who is really good at Pokemon battles and wants to prove himself better than Ash.
Well, one interesting plot point could be Ash encountering new and rare Pokémon in Sinnoh that he's never seen before. Maybe he discovers a unique form of a Pokémon that's native to Sinnoh. Another could be his interactions with the Sinnoh gym leaders, like having intense battles or forming unexpected friendships with them.
Lillie is a likely character. She could befriend Ash and they might go on Pokémon adventures together. She has her own story and growth in the Alola region, and interacting with Ash could add more depth to both of their characters. Also, Ash might meet the Trial Captains like Mallow or Sophocles. They could challenge Ash in different ways and teach him about the island challenges.
A mysterious Pokémon whisperer might appear. This character could have the ability to communicate with Pokémon in a unique way and help Ash better understand his Pokémon, which in turn helps him grow as a trainer during his time without his friends.
There's also 'Ash and May in the Sinnoh Wilderness'. This fanfiction focuses on their exploration of the Sinnoh wilderness. They face various challenges together, like dealing with rare and powerful Pokémon. The way the writer describes their bond strengthening as they overcome these difficulties is really engaging. It also has some great descriptions of the Sinnoh landscape.
It could be about many things. Maybe it's a reimagined version of Ash's adventures in the Sinnoh region. It might feature new characters, new plot twists, or different interpretations of the original story.
I'm not sure who the author is. There are so many fanfiction writers out there, and without more information, it's difficult to determine the specific author.
It could be about a revised or remade version of Ash's adventures in the Sinnoh region in a fan - created story. Maybe it features new storylines, character developments, or different interpretations of the original Sinnoh plot with Ash as the central character.