What if Porygon2 and Dusclops were NU?
Porygon2 would simply be used on every team to be completely honest, outside of stall. This thing can survive any unboosted hit outside of a Choice Banded Close Combat from Sawk and Primeape, which is really impressive. Add to that a base 105 Spa and you've got the best Tank in the tier. Sadly, even though it has a good support movepool with stuff like Trick Room, Porygon2 is still a sitting duck for stall teams, as it doesn't really offer that much compared to other good stall Pokemons like Audino, Zweilous, etc. Overall, I feel like Porygon2 would centralize the metagame around it due to its amazing bulk with Eviolite and good Spa.
As for Dusclops, it was cursed (pun intended) with its low base 40 HP. Dusclops's amazing base 130 Defense and Special Defense might appeal people at first sight, but with this HP stats it won't go far as it'll get 2HKO or 3HKO by most attacks, making it hard for Dusclops to switch in safely in this entry hazard's infested metagame. Don't forget Dusclops has to use the unreliable RestTalk to get any form of recovery (Pain Split is just not worth it personally). Dusclops also has no offensive presence, with its best options being Night Shade or Seismic Toss, making it set up fodders depending of the chosen move. Overall, it'll most probably end up in PU.
What if White Smoke also stopped self-induced stat drops?
The manly SMASHKOAL would simply be a massive threat:
+2 252+ SpA Life Orb Torkoal Overheat vs. 120 HP / 136 SpD Alomomola: 359-424 (71.65 - 84.63%)
+2 252+ SpA Life Orb Torkoal Overheat vs. 252 HP / 252+ SpD Audino: 386-456 (94.14 - 111.21%)
+2 252+ SpA Life Orb Torkoal Overheat vs. 0 HP / 0 SpD Samurott: 328-386 (99.09 - 116.61%)
+2 252+ SpA Life Orb Torkoal Overheat vs. 252 HP / 252+ SpD Camerupt: 211-250 (61.33 - 72.67%)
Torkoal would be able to, at worst, 2HKO the entire metagame.
What if Drifblim got moves like Hurricane and Roost?
I could see Hurricane Drifblim be used on some Rain teams, as Hurricane coming from a base 90 SpA can hurt, nothing else to be completly honest.
Hurricane's accuracy is just too unreliable to my liking and Rain Dance or Roost have to fight with Destiny Bond, Calm Mind, Substitute, Thunderbolt (Ghost/Flying is wall by most Steel-type), and probably more that I'm missing.