>>21219525Without Lowkick, Weavile gets walled by some pretty common mons. Tyranitar comes to mind, though as
>>21219551 mentions Heatran can do it as well. It can also tag bad switches on stuff like Greninja. Check the numbers:
252 Atk Life Orb Weavile Low Kick (120 BP) vs. 0 HP / 4 Def Tyranitar: 588-697 (172.4 - 204.3%) -- guaranteed OHKO
252 Atk Life Orb Weavile Low Kick (120 BP) vs. 0 HP / 0 Def Heatran: 307-361 (95 - 111.7%) -- 68.8% chance to OHKO
252 Atk Life Orb Weavile Low Kick (120 BP) vs. 0 HP / 0 Def Heatran: 307-361 (95 - 111.7%) -- guaranteed OHKO after Stealth Rock
252 Atk Life Orb Weavile Low Kick (60 BP) vs. 4 HP / 0 Def Greninja: 224-265 (78.3 - 92.6%) -- guaranteed 2HKO
252 Atk Life Orb Weavile Low Kick (60 BP) vs. 4 HP / 0 Def Greninja: 224-265 (78.3 - 92.6%) -- 31.3% chance to OHKO after Stealth Rock
Also note that in the case of Greninja, it outspeeds the frog, so if you tag a bad switch in with Low Kick, you can basically finish it off with whatever you want afterwards, or force a switch.