>>28644590Assuming a bulk of 80/60/60 against scarfchomp
252 Atk Garchomp Dragon Claw vs. 252 HP / 0- Def Pyukumuku: 276-325 (75.8 - 89.2%) -- guaranteed 2HKO
252 Atk Garchomp Stone Edge vs. 252 HP / 0- Def Pyukumuku: 230-271 (63.1 - 74.4%) -- guaranteed 2HKO
Basically Pyukumuku NEEDS to get a clean switch in, or else it risks only dealing 38% at best in retaliation.
252 Atk Garchomp Earthquake vs. 252 HP / 0- Def Pyukumuku: 345-406 (94.7 - 111.5%) -- 68.8% chance to OHKO
252 Atk Garchomp Outrage vs. 252 HP / 0- Def Pyukumuku: 414-487 (113.7 - 133.7%) -- guaranteed OHKO
These ones are a OHKO against it with those custom stats, but here's the catch. With 80 base HP and full investment, it puts it at 364 HP total, only 7 points higher than no investment Chomp, meaning that assuming full HP Chomp it ABSOLUTELY needs to come in clean, that means no SR up or it misses the kill. Even with 100 base this happens, too.
You basically have to keep Pyukumuku healthy in the back in order to make it work fully, but that means you are just losing a slot.