Just out of interest, if we were to use the June usage stats alone for the update instead of all 3 months the following tier shifts would happen:
Regidrago would drop from RU to NU
Snorlax would drop from RU to NU
Zoroark would drop from NU to PU
Ooh, these three shifts would've been interesting to see happen. Perhaps they might happen in the next few months, no one is certain. Heck we don't even know if the DPP remakes are a Let's Go scenario or if they're compatible with everything from SwSh.
Regardless, theorymon is my cup of tea, so I might want to give insight:
Regidrago is a mon with dumb strong STABs on neutral targets, and limited but still there ways to hit Steel-type resists. It can easily hit Bronzong with Crunch and Copper with Fire Fang or Hammer Arm. A lack of usable special coverage mainly forces Regidrago to go physical. The main point of comparison is with Guzzlord, with Guzzlord having better coverage and dual STAB, which defensively is a curse in many regards. Regidrago has less weaknesses and is much faster but again has no special coverage and as such is very limited. Still, Banded Outrage or Specs Draco is gonna hurt from this thing. Honestly I think Banded is the way to go due to its better coverage selection:
Regidrago @ Choice Band
Ability: Dragon's Maw
EVs: 252 Atk / 4 SpD / 252 Spe
- Scale Shot
- Hammer Arm / Crunch
- Thunder Fang / Explosion
Dragon Dance is also an option.
Snorlax was a menace when it first dropped to NU, and was promptly quickbanned. Its never come back since, but honestly I think it has a shot of being relatively balanced this time around. We have a lot more strong physical attackers compared to when Lax showed up last time, most notably. Perhaps its still too much of a brickwall for our special attackers that it becomes borked, who knows.
PU Zoroark is something people having been wanting to see happen for a while now, due to Zoroark being a gimmicky mon that in practice is outclassed by other Dark-type attackers like Drapion, Guzzlord, or even Absol. Truthfully though, how Zoroark will fare in PU is anyone's guess. Perhaps it'd be broken for the same reasons it was broken in previous gens of RU, perhaps it'd be a still gimmicky, slightly-less mediocre mon. NP and SD with Boots (maybe even Sash too for its fraility) are still the go-to sets likely, with occasional Choice items. Its Speed stat and U-turn are a huge niche over other PU Dark-types. Being outsped and KOed by Archeops and Whimsicott still sucks but what can you really do? Also yes I know Darkvally and Alolan Persian have these as well but you never see those in PU anyway and Zoroark has a better offensive movepool to take advantage of being a fast pivot.
Grimmsnarl in RU (which was listed up there but not listed in this quoting) I don't see being a particularly notable mon with the loss of Light Clay. Bulk Up shenanigans could be fun I guess. I expect to see it drop further to NU if it does drop to RU though.