:ss/Calyrex-Shadow:
Let's talk about this mon. This one, simply put, is too centralizing and broken. Specs/Nasty Plot/Scarf are all good options, and Calyrex-S has more than enough tools at its disposal to make great use of them. Specs Grass Knot 2HKOs TTar, Pollen Puff 2HKOs Umbreon, Ice Beam 2HKOs Yveltal, while NP trades some power for potential to win the game since it also has Sleep Powder to outplay Sucker Punch. The only pokemon that isn't 2HKOed by anything it throws at is Grimmsnarl, which relies on Moonlight to keep itself healthy. But then a hard Kyogre switchin can instantly diminish that and Grimmsnarl is bad outside of checking Calyrex-S.
252 SpA Choice Specs Calyrex-Shadow Ice Beam vs. 248 HP / 252+ SpD Yveltal: 258-304 (56.7 - 66.8%) -- guaranteed 2HKO
252 SpA Choice Specs Calyrex-Shadow Pollen Puff vs. 252 HP / 252+ SpD Umbreon: 212-250 (53.8 - 63.4%) -- guaranteed 2HKO after Leftovers recovery
252 SpA Choice Specs Calyrex-Shadow Grass Knot (120 BP) vs. 252 HP / 252+ SpD Tyranitar in Sand: 226-266 (55.9 - 65.8%) -- guaranteed 2HKO after Leftovers recovery
:ss/Kyogre:
Speaking of Kyogre, it still does what it does best: Spamming Water Spout. It also benefits from getting a more reliable Steam Eruption and most importantly, Flip Turn. Flip Turn helps Kyogre maintain momentum and bring its checks to 2HKO range, which is very beneficial for the next mon I want to talk about. Besides specially defensive Eternatus and Utility Umbrella Blissey, there really aren't many reliable defensive checks since Ferrothorn gets 2HKOed by Specs.
252 SpA Choice Specs Kyogre Water Spout (150 BP) vs. 4 HP / 252 SpD Blissey: 262-309 (40.1 - 47.3%)
0- Atk Kyogre Flip Turn vs. 4 HP / 252+ Def Blissey: 106-126 (16.2 - 19.3%)
So after a Flip Turn, Blissey is in range to be 2HKOed by Spout, Chansey is still 2HKOed by Spout.
:ss/Dugtrio:
Dugtrio is a very good partner to go with Caly and Kyogre. Kyogre Flip Turn helps bring Duggy in safely to eliminate Blissey and Eternatus, and it can also knock out TTar for Caly. Choice Band is the preferred item to ensure Precipice Blades OHKOs Eternatus.
252 Atk Choice Band Dugtrio Precipice Blades vs. 212 HP / 0 Def Eternatus: 510-602 (107.5 - 127%)
252 Atk Choice Band Dugtrio Precipice Blades vs. 4 HP / 252+ Def Blissey: 444-523 (68 - 80.2%)
The last of the 3 biggest threats is Zacian, while not really gaining anything besides Sunsteel Strike, it still has power to 2HKO everything with Play Rough, Close Combat for Steel, Wild Charge for Ho-Oh and Crunch for Ghost/Psychic + the rare Aegislash.
+1 252+ Atk Choice Band Zacian Close Combat vs. 252 HP / 252+ Def Necrozma-Dusk-Mane: 197-232 (49.4 - 58.2%) -- 66.4% chance to 2HKO after Leftovers recovery
+1 252+ Atk Choice Band Zacian Wild Charge vs. 248 HP / 252+ Def Ho-Oh: 374-440 (90.1 - 106%) -- 37.5% chance to OHKO
Besides the three, most Ubers don't gain much cause they already have access to their most powerful moves, but there are some winners, Necrozma-Dusk-Mane gains Spectral Thief, making mons like Xerneas much less relevant, Groudon and Zygod gain Shore Up, Kyurem-B and Darm-Galar gain Glacial Lance, Zamazenta gets No Retreat and Body Press, Pheromosa gains Web, Specs Dragon Energy.
I expect to see Calyrex-S banned, I will post my teams (not the best) throughout the suspect, if Caly is banned I expect more options to open up.
https://pokepast.es/2647276c47a8fec1
https://pokepast.es/1e8ae8968d2e1a1c
https://pokepast.es/ca82db1f02d3546a