A few things, what if the Clefable is running Softboiled + Magic Guard?
Also, I don't think Hyperspace Fury hits through Substitute, just Protect type moves (someone can confirm this).
Also, 252 Atk Choice Band Hoopa-Unbound Hyperspace Fury vs. 4 HP / 0 Def Tyranitar: 132-156 (38.5 - 45.6%)...