There definitely was a holo version of Volcanion UNB in the Reshizard one. It had the GX texture too. The Tapu Koko Prism was the one which had the equilavent treatment in the other. Most likely it will be Perrserker or Oranguru that will get this I would expect.
It's a great product but there is nothing there to grab the attention of any seasoned players.
Will any Jirachi's be holos? There were some holo Volcs in the Reshizard one. Maybe Perserrker instead.