Hey, I just finished reading.
Oddly enough, I had another idea for a Sinnoh-based fic just by reading the title of your story. :|
Anyway, I like the flow of your writing and the descriptions are interesting. It seems weird that Ash has been in Sinnoh for two years though; must be a big region if he hasn't been in the League.
The new character is...interesting. His unorthodox battle style is ingenious and not obnoxious. Also, his dark background gives a sort of mystery feel to the story.
Just keep it going, I'll keep reading!