I find your reasoning to be flawed.
Last I checked Lopunny runs HO over way more than HO can hurt it. Mega Pinsir is honestly the only threat to Mega Lopunny that HO usually runs, while Lopunny's Fake Out into Return/HJK kills most of the HO mons. It laughs at Mimikyu, Smeargle, Bisharp, Alola...