If this thing gets Shadow Tag ever, it might go to Ubers. It's a Wobb with no Encore, but can attack.
Not Ubers. That's Chandelure. Gothitelle doesn't have the stats to stay alive in Ubers.
Probably OU, definitely UU. It's bulkier than Dugtrio, and won't die as easily. Plus it counters a lot of OU pokemon.