Last night, I had couple Tier Shift games which were the first ones in my life. I have enjoyed playing the meta where otherwise-would-be-subpar-'mons would turn into monsters thanks to the premise of the tier.
However, I have realized the problem that was visible to even the newest of the newest player in the tier that is possibly another universal cancer followed by Tangela:
Pyukumuku.
Because most of my OU teams are based on stall, I attempted on building stall-based teams which would obviously consist with Mega Sableye (turned out to be a shit mon in this meta but needed Magic Bounce), Miltank as pseudo-Chansey which can function as cleric, Golbat as defogger, and Unaware Quagsire as a setup check. After being obliterated by Nasty Plot Ninetales, I have decided to get Unaware user, and the first thing that came up to me was Pyukumuku.
Outsides tier shift, due to low HP stats, Pyukumuku tends to struggle functioning as an efficient wall. However, story is different in Tier Shift.
This monstrous bulk lets Pykukumku live 2 Solar Beams from base 120 SpAtk assuming non-STAB, and gives 0 fuck to most offensive 'mons. As I was using Pyukumuku, it's bulk turned out to be capable of doing stuff like this:
252+ Atk Guts Gurdurr Hammer Arm vs. 252 HP / 252+ Def Pyukumuku: 144-169 (36.5 - 42.8%) -- 97.8% chance to 3HKO after Leftovers recovery
252 SpA Choice Specs Typhlosion Focus Blast vs. 252 HP / 0 SpD Pyukumuku: 130-153 (32.9 - 38.8%) -- 6.9% chance to 3HKO after Leftovers recovery
Especially for Gurdurr, according to my short experience, it mostly gets Drain Punch and that means it can't break Pyukumuku after prior damage and after x1.5 Attack boost from Guts triggers after being poisoned. Choice wallbreakers can't break Pyukumuku without doing some prior damage, and if they just stay in for rolls of secondary effect, they just end up losing their STAB boost thanks to Soak.
I am pretty sure Pyukumuku is not the only 'mon which boasts this level of monstrosity in bulk, but the ones who are able to have similar bulk as Pyukumuku are usually reliant on its typing and Eviolite, which can be ruined by omnipresent Knock Off. But Pyukumuku is the freakin Unaware wall that has like 2 weakness, and this leaves status as the only way to actually cripple it, but because of Pyukumuku's passive nature, it is mostly accompanied by semi-stall or stall teams in which cleric most likely exists.
I thought it would be just me but Aman Indra agreed that Pyukumuku is one of the most impenetrable walls in the current metagame that is causing some sort of unhealthiness and was eager for suspect / ban. However, because I feel like I have to lurk around more in this meta, I will stop here.
While we are able to stop this Pyukumuku using Taunt or Substitute, it can still invalidate most offensive teams that do not specifically prepare to break it (in my perspective), and I believe Pyukumuku is definitely a worthwhile topic of discussion for current Tier Shift meta. Thanks for reading.
However, I have realized the problem that was visible to even the newest of the newest player in the tier that is possibly another universal cancer followed by Tangela:

Pyukumuku.
Because most of my OU teams are based on stall, I attempted on building stall-based teams which would obviously consist with Mega Sableye (turned out to be a shit mon in this meta but needed Magic Bounce), Miltank as pseudo-Chansey which can function as cleric, Golbat as defogger, and Unaware Quagsire as a setup check. After being obliterated by Nasty Plot Ninetales, I have decided to get Unaware user, and the first thing that came up to me was Pyukumuku.
Outsides tier shift, due to low HP stats, Pyukumuku tends to struggle functioning as an efficient wall. However, story is different in Tier Shift.
This monstrous bulk lets Pykukumku live 2 Solar Beams from base 120 SpAtk assuming non-STAB, and gives 0 fuck to most offensive 'mons. As I was using Pyukumuku, it's bulk turned out to be capable of doing stuff like this:
252+ Atk Guts Gurdurr Hammer Arm vs. 252 HP / 252+ Def Pyukumuku: 144-169 (36.5 - 42.8%) -- 97.8% chance to 3HKO after Leftovers recovery
252 SpA Choice Specs Typhlosion Focus Blast vs. 252 HP / 0 SpD Pyukumuku: 130-153 (32.9 - 38.8%) -- 6.9% chance to 3HKO after Leftovers recovery
Especially for Gurdurr, according to my short experience, it mostly gets Drain Punch and that means it can't break Pyukumuku after prior damage and after x1.5 Attack boost from Guts triggers after being poisoned. Choice wallbreakers can't break Pyukumuku without doing some prior damage, and if they just stay in for rolls of secondary effect, they just end up losing their STAB boost thanks to Soak.
I am pretty sure Pyukumuku is not the only 'mon which boasts this level of monstrosity in bulk, but the ones who are able to have similar bulk as Pyukumuku are usually reliant on its typing and Eviolite, which can be ruined by omnipresent Knock Off. But Pyukumuku is the freakin Unaware wall that has like 2 weakness, and this leaves status as the only way to actually cripple it, but because of Pyukumuku's passive nature, it is mostly accompanied by semi-stall or stall teams in which cleric most likely exists.
I thought it would be just me but Aman Indra agreed that Pyukumuku is one of the most impenetrable walls in the current metagame that is causing some sort of unhealthiness and was eager for suspect / ban. However, because I feel like I have to lurk around more in this meta, I will stop here.
While we are able to stop this Pyukumuku using Taunt or Substitute, it can still invalidate most offensive teams that do not specifically prepare to break it (in my perspective), and I believe Pyukumuku is definitely a worthwhile topic of discussion for current Tier Shift meta. Thanks for reading.