Auraninja
Eh, ragazzo!
What if... there was a mythical UB? *sunglasses*Unless it's a new mythical, the dex has no more room for UBs and there's no reason to shove them after the mythicals in the alolan dex.
I don't think we could get anything other than a mythical at this point. It would be weird to add another non-Ultra Beast Pokemon, given the mysterious nature of the aforementioned UBs.