I like the idea, it sounds like a fun idea. I love the thought of mixing the Pokemon world with a system of "balance"; someone trying to balance themselves to the point where their transgressions as well as their virtues are joined together in harmony.
The cameo aspect looks fun too, I'd gladly sign up my main character, Hawthorne from the Kyuusaisha. I think he'd fit in quite well in this world of yours, Sango.
-Grey