S Rank
Still irreplaceable like standard Mono.
Venom provides so much for Poison in one slot that if you're not running it, you need an incredible reason why. It frees up Weez-G to be neut gas, not scared of Neut Gas/Mold breaker users like Miasmaw and Excadrill clicking EQ, can set hazards, can foul play, can knock, can pivot, can be specially defensive, can be physically defensive (I think physically is better to get the most out of body press). Basically it does everything except wall psychic types and honestly, that is fine by me.
A Rank
Yeah, this thing is goated and I was unironically sleeping it on it for the longest time thanks to the quad ground weakness being so unappealing.
Pex not being in the original VR is a crime, Its still Toxapex and should be greatly considered for most Poison teams worth their salt. Toxapex is still the most reliable Haze mon Poison has access to thanks to being the only one with natural recovery and has the easiest time getting Toxic onto its moveset. Also only bulky Fire resist we really have unless you want to run Mollux with Illuminate.
Most CAPs do not hit 110+ making Moth an incredibly deletion option against them, especially since a lot of them are weak to Moth's STAB Flamethrower and if not, generally aren't fond of coverage making it hard for a lot of them to get in. Both Specs and Boots have legitimate reason to be ran and I often switch between the two on my Neut Gas team.
Similarly to moth, Sneasler's speed tier is just too valuable not to consider on most teams.
Its still the best AV user of the type with a fair few new problematic special attackers, it is a genuinely good mon to consider for this to handle them. Future Sight + fully physically Venomicon's Body Press is also disgustingly strong.
B Rank
Only Ground neutrality that is good. While a new Ground immunity does exist, if gravity goes up Amoonguss is the only one that can help to weather the storm. Also our only other option for Foul Play making it our only other super reliable physical Pult check.
Venomicon forces this thing into a harder situation to be fitted onto teams, but with the option for Neut gas opened up, I think its still good or you can run a double ground immune core with one specially defensive and one physically defensive.
While a fair few new problems have arisen for its bulk up set (Equilibra and Arghonaut are two that come to mind) Its still great at being an endgame bulk up win condition and still the best steel check Poison has access to along with having the most reliable anti Landorus tool for Poison in Scarf Ice Punch.
Terrifying endgame mon if positioned well. Can be hard to get to that endgame on ocassion and if it can't get setup its not going to be that great but still worth considering.
Venomicon can do a lot of what Runt does, but its higher base speed and superior natural bulk (especially right out the gate before Stamina boosts and against Neut gas Miasmaw) keep it a worthwhile threat to consider.
Unaware has too much value not to consider, and with new setup threats + Electric being more of an actual threat its worthwhile to consider.
C Rank
No comment on this things original placement. I don't like Glim.
Slower than Iron Moth and Gengar while not hitting any harder is a huge annoyance. That being said, hard checking Urshifu-R and Azu and improving Flying, Water, and Possibly even Ground for Poison is super nice (just need to get it setup first in the ground MU which can be hard.)
I honestly think Specs Shadow Ball is worth considering as a super spammable cleaning tool, Good if you need a big fuck you tool for Steel and possibly the mirror thanks to Trick shutting down AMuk opening up other options, but not Moth is more flexible in my opinion.
D Rank
Better Steel MU Corrosion wise (compared to Glimmora) thanks to threatening Ghold (and most the type in general) far better and its speed tier is nice, still not really worth it.
AMuk exists, Spikes are nice and it can check physical Psychics. Problem is unlike Weez-G which offered tons of utility to keep its value high, Overqwil's utility is not enough.
This is a utility mon really with mediocre bulk and only okay speed. Still its utility is nice and is a decent AV user. I've also ran it as a scarfer before and it does check Volcarona and Fire-types somewhat decently barring stone edge misses (to the point where I ran Rock Slide just to avoid playing the Stone Edge game against Volc) but it wants something more.
Everything else is unranked. Geniunelly got no idea how you guys let Munkidori and Toxtricity slip onto the list originally. I also don't see Venomicon-Epilogue doing too much cause it means giving up Venomicon base as a check to half the tier's physical attackers.