Should be noted that UB Sticky isn't
actually the first UB to evolve - the Cosmog line are UBs.
EDIT: Forgot the Aether Foundation actually referred to Nebby as a UB, so it
is stated in the games. Edited out the bit that wasn't sure on it being stated directly. Also, seems the OP has since been edited to that effect, too! So nevermind all around!
Really do think Nintendo need to be a bit more stringent on the review copies next time around, though - these leaks every release are getting old, fast. I'm willing to check them out, myself, but others that are trying to avoid them prior to release can have a hard time once info like this starts flooding the web. Also puts a big ole dent in their marketing strategy, too, so it behooves them to do so (see: the last bit of news we're supposed to get here soon).
I am glad to see there's even
more interesting stuff going on in USUM, though.