I found evidence for their existence in other sources before that post even went up. The ones that had somewhat detailed information to them included Unova, which appears to be rather far away from Kanto and Johto.
Well, it... doesn't seem like there's not communication, oddly enough. There's just barely any information.
[audio]
Well, it... doesn't seem like there's not communication, oddly enough. There's just barely any information.