Sken
Wow. Infestation does that? I never knew. The name suggests it though. That's why smogon features the set with infestation.180+ Atk Pancham Knock Off (97.5 BP) vs. 116 HP / 156+ Def Eviolite Shelmet: 5-7 (21.7 - 30.4%) -- 84.5% chance to 3HKO after Stealth Rock
180+ Atk Pancham Gunk Shot vs. 116 HP / 156+ Def Shelmet: 9-11 (39.1 - 47.8%) -- guaranteed 2HKO after Stealth Rock
At max rolls for both and with this EXACT combination after SR, you lose. But that's a specific situtation that's almost never going to happen, and Shelmet is obviously the most reliable counter among all of these imo despite it not really being popular. Plus you're not going to have a gunk shot vs recover war w/ shelmet. LoboMuenza, you should always provide calculations and justification for your nom as it makes ppl understand your choice. Nevertheless, LoboMuzenza
edit: also infestation shelmet can even trap pancham then toxic stall so there's that