The usage stats for January are here as our first look of a mostly Opportunist-less metagame for 2/3rds of the month.
The battle count for this month reaches
71520, dropping off a bit from the new gen's peak but still higher than the ending months of Gen 8.
https://www.smogon.com/stats/2023-01/gen9metronomebattle-1630.txt
https://www.smogon.com/stats/2023-01/moveset/gen9metronomebattle-1630.txt
1630 Top 10 + last positions from Gen 8's final November stats:
#1: Mega Ampharos (#6)

#2: Ting-Lu (#1)

#3: Mega Heracross (#5)

#4: Mega Sableye (#13)

#5: Mega Venusaur (#3)

#6: Mega Gengar (#8)

#7: Iron Hands (#4)

#8: Glastrier (#2)

#9: Dusclops (no change)

#10: Dondozo (#29)
Mega Ampharos takes the lead this time with a 25.5% weighted usage, almost doubling Ting-Lu's 13.8% trailing behind it. Meanwhile, Mega Venusaur continues its decline from the top spots despite Opportunist's ban, though still maintaining its highest raw usage of 13397. Heracross slowly rises up again while Mega Sableye and Dondozo return from the depths, showing it can still be viable on its own terms with a Choice Band and Magic Bounce, and surprisingly the same set applies to Sableye. Diancie and Hisuian Zoroark fell off from last time to #31 and #21 respectively, though they still retain their high uses (3436 and 13094), with Zoroark notably still having the 2nd most raw uses as a very common pick.
The dark horse of the month is Keldeo, barely outside of the top 10 at #11 with only 122 uses amongst the other thousands. Other fellow legendaries with high placements for low uses include Volcanion (#15, 730) and Necrozma (#22, 220). It seems like (double) Volcanion has a lot of variety going on with its ability and item choices (Ice Scales, Intimidate, Lightning Rod, Tinted Lens, Power Spot, Choice Specs, Mirror Herb, Normalium Z, Clear Amulet, Weakness Policy all listed and above 13.350% except Weakness Policy at 9.340%), while Necrozma is more straightforward with mostly just Magic Bounce and Normalium Z working out with an Iron Hands partner, which is probably the main carry of the team and the one to tera since Normalium Z prevents terastallization.
Overall I feel like these weighted stats are more developed than last time with more ranked players to base around, so it's pretty interesting to see how things have changed from last month even with the Opportunist ban, with some mons having less raw usage in general but actually rising up quite a bit relatively. Dragonite went from #34/3199 to #16/2358 and Baxcalibur went from #24/5539 to #17/2121. For a specific example of a mon whose archetype was heavily impacted by Opportunist, Mega Abomasnow went from #140/866 to #26/797.
On the other side of the rankings, the bottom 5 mons of the month are Dracovish in #985/10, Hitmontop at #984/27, Ash-Greninja (I think this is just counting Battle Bond Greninja) at #983/143, Maushold at #982/250 uses, and ending off with Flabebe because it is in #981 and only has 1 use, so all these other mons managed to lose harder than a mon that showed up once. For last month it was Kingdra/Silvally-Grass/Dracovish/Hitmontop/Ledyba. Looking back even further, Dracovish and Kingdra were both bottom 2 in Commander November and Shedinja was bottom 6, just above Brute Bonnet, base Wishiwashi, and Zeraora. So far the water/dragons have been the lowest weighted usage mons of Gen 9 somehow, and it's not even that bad of a typing to deserve it. I think Dracovish could be redeemed with a few more wins.
(I probably contributed to Battle Bond Greninja's performance with this
moment of friendly fire.)
Over in the moveset file, Ting-Lu and Hisuian Zoroark are the main examples of high mons whose usages are still dominated by Opportunist from the start of the month, while Mirror Herb remains a wild card pick on quite a few mons as well. Overall Good as Gold can be observed as a common variety pick, taking the top ability slot on some different mons like Mega Gengar and Type: Null. Choice Band is actually the #1 weighted item pick on Mega Sableye now as mentioned earlier, though with the default Sablenite still in 2nd.
The viability ceilings for this month top off at 78 with Mega Heracross alone, followed up with Mega Sableye at 77, and Ampharos/Venusaur/Iron Hands/Abomasnow following a bit behind at 74. Ampharos in particular has some variety going for it with Plus/Good as Gold/Beads of Ruin/Hadron Engine all with >10% usage. After that we have Ting-Lu in 73, and we end off the top 10 mons with 72 featuring Keldeo (Minus with Mega Ampharos), Mega Lopunny (Scrappy Normalium Z + Ting-Lu), and Alolan Muk (Poison Touch/Levitate). Alolan Muk in particular achieved a major glow up comparable to Diancie, going from #773 (out of 980) with 309 raw uses, to ooze over 700 spots up to #52 with 325 uses, which I guess says more about the dedication and luck of the player than the mon in this case.
(I noticed that Maushold has a viability ceiling of 0 in the
raw usage moveset file. I think there might be a floor to it, because a lot of other mons show the same thing and the lowest real viability ceiling I could find is Unown with 30.)