Definitely not a bad error due to the terrain but on route 2 when rufflet uses air drop on my walrein (haven't experienced with other pokemon), my walrein gets "stuck" at the top. It says air drop missed and then I can't switch out or run because I'm stuck in the first part of the air drop. Luckily it's route 2 so rufflet will hurt itself on the rocky terrain until it faints. Not a huge deal but maybe of note.