Well, perhaps in this fanfiction, Ash is on a solo quest in Sinnoh to find a way to improve his Pokémon training skills even further. He could be traveling from one town to another, meeting new trainers who give him unique tips. Along the way, he might encounter some legendary Pokémon that test his abilities in unexpected ways. This would not only be a great adventure for Ash but also a chance for him to grow as a trainer without the help of his friends.
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.
Ash might meet some lone Pokémon trainers. These trainers could be on their own quests, similar to Ash's. They might have unique Pokémon or training methods that Ash can learn from.
Well, in 'ash travels alone fanfiction', there could be many exciting stories. Maybe Ash encounters some rare and powerful Pokémon that he has to battle alone. For example, he might come across a shiny legendary Pokémon in a hidden cave. He has to rely on his own skills and the bond he has with his existing Pokémon to face this new and formidable challenge.
One interesting plot could be Ash facing a new and extremely powerful Pokemon on his own. He has to rely solely on his own skills and knowledge of Pokemon to figure out its weaknesses and try to catch it. This would show his growth as a trainer without the help of his friends.
Ash could develop his character in Sinnoh by becoming more strategic in his battles. Since Sinnoh has a variety of strong and unique Pokemon, he'd need to think more carefully. Misty could develop by becoming more independent. Maybe she takes on some solo adventures in Sinnoh, away from Ash for a bit, and this helps her grow as a trainer.
His first Sinnoh Pokémon could be a Chimchar. Imagine Ash finding Chimchar being bullied by some other Pokémon. Ash steps in and Chimchar decides to join him. Chimchar's energetic and mischievous nature would add a lot of fun to Ash's Sinnoh adventures as it grows and evolves into an Infernape.
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.
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.
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.