^Don't have time to respond to anything else... I just want to point this out:
That's Regirock's Stone Edge with no EV investment and an attack-neutral nature against the first Crobat set in the analysis, which does have a sizable HP investment (104 EVs). So, Stone Edge does make the cut quite well.Edit: And I had done the calcs incorrectly for Stone Edge; I was using the wrong tab, which I had set for something else. The correct calcs are 77.15% - 91.39% without Expert Belt and 92.58% - 109.50% (53.85% chance of OHKO) with.