OK- I have not touched my Hoopa - and................ it will not compute as well.
one of two things:
either the calculators are "calibrated" wrong for the stats
the McDonald Hoopa has a special/unique feature toit.
I will look into this and as to why it will not compute---------
edit-----------------------
use this calculator found here:
http://www.psypokes.com/dex/iv.php
try Veekun site or Azurilland
*make certain to not input "unbound" Hoopa- I do think this is where there might be the issue for getting a proper calculation.
Just make sure to check the options in the calculator- I made the mistake with the "unbound" with Serebii and Metalkids calculators.
They are calibrated for voth forms of Hoopa-
Use Psypoke calculator for your Hoopa, which it right off gave me my IV's for my Hoopa without any issues on form unless I specifically typed in Hoopa Unbound-
hope this helps-