I have the same issue. It seems to be specific to the Unova region. SO if you want to continue to run around you should do so avoiding Unova.
EDIT: Add Sinnoh to the "forbidden" regions. Hoenn and Kanto are fine
I just lost my OU Ranked match bacause it suddenly was all tiers including Uber. Wobbugget screwed me over bigtime. Why didi this happen?
EDIT: Happened next match as well. I won though. But didn´t win any Reward Points. I´m fairly new to the game so maybe i am missing something?