None
If this thing ends up with shelless version prevo I will punch everything.
And I'm not really a fan of it having a prevo in any case, regardless of those stats. Its BST isn't much higher than something like Scyther anyway.
EDIT: Lapras, Zen Darmanitan, Snorlax (pre-gen IV) - there's three unevolved Pokemon with BST > Mollux, so yeah its not unprecedented.