Damn, I didn't know Ferrothorn countered Pheromosa...how is tapu not broken for 2 OKing the whole tier with specs(1 set covers everything it needs) but pheromosa is broken instead with a number of checks like toxapex, mega sableye, ferrthorn buzzwole, steel flying pokes, mega scizor, marowak. u-turn spam hurts bad but generally there's a decent switch in to most of it's options to scout.
honestly mega sableye got nerfed this gen losing prankster pre-mega evolving, burn nerf, toxapex and fairies that tear it's throat out super fast.
even shiinotic's spab moonblast can tear trough it quick enough, or random Z-move lures.
Lele is likely the most broken thing in the tier right now and really aids pheromosa with psychic terrain
wait how does vested Tartar do pursuit trapping tapu lele?
Anyways, they're not comparable at all. Tapu Lele is a wallbreaker while Pheromosa is a pivot. Both do their job extremely effectively - one breaks its "counters" with a coverage move while the other pivots out on them. However I don't think we should be quick-banning anything, we've got the worst out of the tier let it settle a bit.