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So a lot of dummy/unused stuff in this game is kind of common knowledge. This stuff is discussed in some of the docs on this site, you can find more on TCRF (https://tcrf.net/Phantasy_Star_IV:_The_End_of_the_Millennium). There are a few unused items (map, Blood Axe, Spiral Slasher, something ring-like), some enemies that were removed outside of Japan (Acacia/Shadmirage), an attack used by those enemies (Star Dust), and of course the famous Feeve.
Just recently, Scootaloo on Fringes of Algo brought up the enemy ability called Destrocray. Well, not really recently; it was March. That's recent in Phantasy Star fansite time. Here's the thread: http://www.psalgo.com/boards/view-post96066.html#p96066 Scootaloo actually references my data dump docs and I never realized this attack was completely unused, but indeed it is. No idea why it was removed or who it was intended for. My best guess would be DF2. It would take some hacking and experimentation to learn more.
The feral chocobo calls with a boisterous "wark," not the domestic breed's mild "kweh."