View attachment 95764 Ultra Necrozma: A- --> B+
I personally think that Ultra Necrozma should be a B+ as it does check quite a few very powerful threats like Primal Groudon, Primal Kyogre, most Arceus formes, etc. However, it has trouble with other good mons. Some of these are scarf Xerneas, scarf Yveltal/defensive Yveltal, M-Sableye, Marshadow, M-Gengar, Arceus-Dark, and Celesteela for both the Swords Dance and Calm Mind sets. Don't forget Zygarde if transformed for SD set and Blissey/Chansey for the CM set. It's certainly a good Pokemon in the meta right now but not A- material in my opinion.
View attachment 95762 Deoxys-S: B --> B+ (Lower half of B+)
This may seem odd but Deoxys-S is among the best hazard setters for offense due to its speed and access to both Stealth Rock and Spikes as well as taunt. And if you play HO or Offense in general, you would know hazards are quite important to guarantee many kills. However, it does have to contend with Magic Coat, Magic Bounce, and more Defoggers. It also does have to compete with Excadrill and Cloyster for hazard lead. That's why it should go to B+ but not higher.
View attachment 95765 Arceus-Flying: B+ --> C-/D (Lower half of C-/Upper half of D)
Arceus-Flying is very much a waste of a team slot due to the fact that it's just outclassed at everything it does. Yes, it can switch into Primal Groudon's Precipice Blades and other Ground-type moves for free. However, it can't do anything another possible Flying-Type and general team member can do better. As a support Arceus, it's completely outclassed by Ground, Water, Fairy, Dark, Dragon, and even Grass Arceus' to an extent to better defensive typings and lack of Stealth Rock weaknesses. As a Calm Mind Arceus, it's outclassed by Fairy, Dark, and Ground Arceus' due to their better offensive and defensive typings and in the case of the former two, they also have the ability to run mono-coverage STAB judgement. As a Swords Dance Arceus, Extreme Killer, Ground, Ghost, and even Dragon Arceus are better due to their superior STABs and typing. It's outclassed as a Flying-type attacker by Yveltal, Shaymin-S, M-Salamence, Rayquaza, both Landorus variants, and Ho-Oh. As a defensive Flying-Type, it's outclassed by Yveltal, M-Salamence, Landorus-T, Ho-Oh and Lugia. Even as a defogger, both Giratina formes (Giratina-O especially due to its Ground immunity), previously mentioned better support Arceus formes, M-Scizor, Landorus-T, Xerneas, M-Salamence, and Yveltal. All of those except for M-Salamence and Yveltal also aren't weak to Stealth Rock. When your Smogon article had almost nothing nice to say about you and there's all of this better competition, that's pretty bad.