Just wanted to pop in and commentate a little on the state of GSC PU currently as well as Poliwhirl. Mainly want to summarize thoughts from various discord discussions and expand a bit, as well as make it more of a "formality" by putting it here on the forums.
First, about Poliwhirl.
Poliwhirl is an extremely cancerous and straight up unfun presence in the metagame. It's faster than most viable Pokemon and has enough bulk after a Belly Drum to where if it's given free setup, really only an Elekid Thunder or Venomoth Sleep Powder/Stun Spore will stop it in many situations. It does have some limits, as it cannot OHKO Hitmontop, Seadra, or Tangela from full HP and usually cannot OHKO Venomoth, but the ability to Lovely Kiss anything and force things asleep as well as the fact that usually multiple Pokemon on the opponent's team are asleep after having clicked Rest or have been chipped makes dealing with Poliwhirl extremely unreliable and often game losing. Of course, the most straightforward way to deal with Poliwhirl is to use Elekid, but Thunder has a 30% miss chance, Thunderbolt is quite bad, and it's not uncommon for Elekid to run RestTalk sets. Voltorb can also deal with Poliwhirl with Thunder Wave or Explosion (in addition to Thunder), but Voltorb is significantly less common and often uses Explosion early in the game. Most times, Poliwhirl being in a game either reduces it to a gamble on whether or not it can cheese through Elekid or it just completely dominating, especially if the opponent doesn't have Tangela.
Some Poliwhirl replays I've found:
https://replay.pokemonshowdown.com/gen2pu-2406178046-iae2heexyi7wdmawaig94eue8an4cuypw
https://replay.pokemonshowdown.com/smogtours-gen2pu-843117
https://replay.pokemonshowdown.com/smogtours-gen2pu-828519
https://replay.pokemonshowdown.com/gen2pu-2319928862-bgimphf7hnio6m9298syl5okpa2pm15pw?p2
https://replay.pokemonshowdown.com/gen2pu-2403797997-hxyfh1sx86hka5wsn5tf34bqiruya35pw
https://replay.pokemonshowdown.com/smogtours-gen2pu-859073
The other point I wanted to talk about is the general state of progress in battles. In many cases, it's not too difficult to build a team that is extremely defensively sturdy against most common Pokemon and is generally very difficult to break through without a specific threat, strong play, or hax. For the most part, I don't mind this, as I see it as rewarding good building and play and there's usually a way to break through. Others don't agree with me, but that's fine. What is more troubling is how while the majority of Pokemon you can deal with just fine, there are a few specific offensive monsters that are just impossible to deal with reliably. Poliwhirl is one of them, but to a lesser degree Substitute Seaking, Screech Venomoth, and 3 attacks Seadra can just run through defensive teams with little trouble and still don't have very good counterplay on more aggressive teams. The dichotomy feels very strong and it's not uncommon to see a pretty normal game get completely flipped on its head when something stupid like Sub Seaking comes out when your Seaking check is Tangela, and many teams can't afford to account for these threats in the builder since it will make your Pokemon so much worse against everything else.
In general, Venomoth especially feels extraordinarily oppressive, as it's faster than most Pokemon, is versatile to the point where it has a ton of different sets it can run (RestTalk, Curse Pass, Status + 3 attacks, 3 attacks + Screech/Whirlwind/Thief, Status + 2 attacks + Screech/Whirlwind/Thief) that are all extremely effective and each have little downside to be using. At any point it may or may not have the perfect set or coverage move to beat your checks, and even if it doesn't, it might run you over anyways because it's so demanding in the builder and in battle and has just enough power to muscle through, especially when factoring in Spikes or RNG.
I'm not entirely sure what the fix to these problems would be. The first thing I would do is ban Poliwhirl, but largely that doesn't fix the second issue I outlined. I would also ban Venomoth, but I understand that's a fairly controversial idea and I'm not sure if the following metagame would be any better, especially with Hitmontop and Machoke instantly becoming so much more powerful. Ironically enough, Venomoth going would likely make Seaking even better, as despite grasses benefitting heavily from the lack of Moth, non-RestTalk Seaking loses one of its best checks (Status Moth) and Substitute still farms Tangela. Seadra would also have even greater freedom to run 3 attacks without desiring RestTalk to stave off non-Giga Drain Venomoth and its Sludge Bomb Poison or status moves. Another "fix" could be to ban even more things like Elekid, Seadra, or Seaking, but I don't really know how to feel about these, and in general I don't think GSC PU has any one singular issue that can be fixed with one change (except Poliwhirl, but again, metagame still has issues).
Freeing Arbok also doesn't really change the metagame significantly. From the games I saw of it in GSC Slam League, it tended to be somewhat low-impact and often really held back by power issues, mainly when it came to trying to break through Venomoth/Seadra/Cubone. However, I'm fine with it dropping, as its power level is very reasonable for the tier to handle and it wouldn't be an amazing or metagame-transforming Pokemon.
Active VR tiering with more drops from NU (likely below C+) would certainly shake up the metagame and transform it, giving it a fresh start. However, we don't really have a stable playerbase to do that, let alone a playerbase that will consistently be active and driven, participate in discussion, and continue growing. Too many of us who play don't participate in discussion, or are forced to play these tiers for a single team tour due to poor drafting, or play once or twice a year for the tier's generational classic or GSC Slam, or simply aren't interested in playing GSC PU. There is also no council for specific GSC Lower Tiers or even just a general GSC LT Council to keep things going at a steady rate. This also applies to GSC UU and NU, but it feels most applicable to PU since the tier has more issues. I am not faulting anyone for things being this way, nor do I think people should be obligated to participate in discussion or even just stay active and keep coming back to play GSC PU. But I hope you understand how I feel.
As it is now, forgetting the idea of active tiering, even just the other things would likely improve the state of GSC PU and GSC Lower Tiers so much. Unfortunately, that is not how it is now, so the idea of "wiping" PU by doing a mass drop sounds like a pretty bad idea for sustaining the metagame, let alone that we'd be erasing the past ~1 and a half years of this tier's history and many may not even want active tiering in the first place (myself included honestly).
I'm largely just venting my frustrations, but maybe some of this reached you. I am not asking you to do anything necessarily, just to read and understand. That's about all. Ban Poliwhirl, and if anyone else happens to be interested in pursuing a vote, please please make your voice heard so that we can justify starting one and getting rid of this cancer.