I don't think it's really ban worthy. It doesn't actually have "excellent bulk"; it needs the opponent to be burned/needs to have a couple of Calm Mind boosts to sponge physical/special attacks comfortably. Fairies in general also kinda counter it, Clefable in particular, since they're the one type it's weak to and non-CM sets have basically no offensive presence (not to mention that the common Fairies aren't exactly frail, and the CM set needs time to set up). And while you can't status it directly because of Magic Bounce, you can still burn it with Scald and Lava Plume or even poison it with the occasional Sludge Bomb or something, and it really does not like being burned/poisoned, it makes it a lot harder for it to stall that way. And as good as Magic Bounce is, losing Prankster priority after the first turn kinda sucks.
Are they gonna ban that piece of **** Gothitelle or not though?