A couple days ago, I saw an Obstagoon appear in the overworld at Route 2, on the other side of the lake there. I battled it, but I ended up running away because I wasn't quite ready to catch it yet. However, on every subsequent time I've gone back to that same place, it has never shown up, so I'm wondering how much longer I'll have to wait, if it's even coming back. Please note this doesn't include overworld encounters in the wild area, this is just asking about overworld encounters on the routes.