they're supposed to do that after you've beaten them, happens in vanilla unmodded too(normal is 76-78, challenge 80s).
and theres an item gide in the pdf with the file.
to answer the question no specific mention in the item changes file so try rt 9 department store(most evo items are added there), if not there than go to bulbapedia and see where its found normally(it'll still be) --- so at least its in: Giant Chasm, Battle Subway, PWT