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UBs tend to have very peculiar stat distribution (like Nihilego has great special bulk, but is paper thin on the physical side).
Maybe Ultra Space variations of regular 'mons could have the same BST, but the same signature odd stat distribution of UBs. For example something that has Attack as its highest stat would have that stat raised immensely, but say its Special Defense is the lowest stat, so it'd be maybe around something pathetic like 20-40.
Just and idea.
I'd like to see what they'd look like, but knowing GF, they'll forget all about Ultra Space come Gen VIII, with exception of maybe one throwaway line somewhere.