Why is Yveltal S-Rank? It seems more like a necessary evil than an actually good Pokemon. Perhaps its because I'm only using the Utility sets, but I find that Yveltal doesn't really do anything outside of Defog, countering Calyrax-S, and Knocking off the occasional item (which is inconsistently useful since a lot of mons like Eternatus just run one-time use items like Sitrus Berry. Outside of Calyrax-S, I haven't found it to be good at really checking or countering much else (maybe the occasional Giratina-O / Zarude but that's it). Necrozma-Dusk mane is a bit of a hard match-up since it might have Weakness Policy, T-wave, or something else to screw Yveltal over and subsequent Knock Off's don't deal enough damage.
Why does Calyrax-S not run Pollen Puff? Seems like a better move against Tyranitar / Zarude than Draining Kiss.
Why is Marshadow not S- or A+ Rank? This Pokemon genuinely feels impossible to deal with or switch into. Spectral Theif is also just way too good, preventing mons like Necrozma-Dusk Maned or Groudon from using Swords Dance, lest they want to get reverse swept.
Why does Calyrax-S not run Pollen Puff? Seems like a better move against Tyranitar / Zarude than Draining Kiss.
Why is Marshadow not S- or A+ Rank? This Pokemon genuinely feels impossible to deal with or switch into. Spectral Theif is also just way too good, preventing mons like Necrozma-Dusk Maned or Groudon from using Swords Dance, lest they want to get reverse swept.