ChoShadow
That One Fear In My Enemy's Eyes
I'm working on my character right now whose half-blind and has a Litten as his starter Pokemon if that is alright. If not, then I can come up with another Pokemon starter from the Kanto region where he is from. My plan for the reason he has a Litten instead of a Kanto starter is due to their being four other people in his year group who were getting Pokemon at the same time so Professor Oak had to get a couple of Pokemon from two other regions.
Litten is fine. You are allowed to chose any, be it a known starter or not, Pokemon for your adventure. Josephine has a Tropius, as an example, and she started in Kanto.
The Pokemon are not limited to their regions as in the games. All Pokemon are capable of being seen anywhere in the world in any region so long as the geography and climate are ripe for them to survive and thrive.