It's possible that he received it as a gift from Professor Oak. Oak might have discovered a way to transfer Mega Stones across regions and sent the Charizardite to Ash in Sinnoh. Another option could be that Ash made a trade with another trainer. He traded one of his Pokémon for the Mega Stone, knowing the potential of Mega Charizard.
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.
Well, it could mean that Ash has an extremely powerful ally in the Sinnoh region. Maybe he uses Mega Charizard to battle against powerful gym leaders or face off against the evil teams more effectively. It might also attract the attention of other trainers who are either in awe or jealous of his powerful Pokémon.
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 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.
One of the main themes in 'ash sinnoh master fanfiction' is self - discovery. Ash discovers new aspects of himself as he aims to become a Sinnoh master. The theme of legacy also plays a part, as he builds on his past achievements in Sinnoh. Additionally, the theme of exploration is common, as he explores new areas in Sinnoh and discovers new Pokémon species. He also often has to overcome challenges that test his character and determination, which is another important theme.
Perhaps in this fanfiction, Ash has formed stronger bonds with his Pokémon. These bonds allow them to perform at their best in battles. His Pikachu might have learned a new and super - effective move. Also, Ash could have received some secret training from a Sinnoh Pokémon master who taught him unique battle techniques. This would all contribute to his victory in the Sinnoh League.
One great 'ash daisy oak sinnoh fanfiction' could be about their adventures in Sinnoh. Maybe Ash teams up with Daisy and Oak on a special research project there. They could encounter rare Pokémon and have to solve various mysteries.
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.
One possible plotline could be Ash starting his journey in Sinnoh and quickly befriending a rare Pokémon that is shunned by the local trainers. He then has to prove the Pokémon's worth. For example, it could be a shiny Zubat that is thought to bring bad luck. Ash, with his determination, shows everyone that it can be a powerful and loyal partner.