I don't know about you, but I think Zangoose is pretty terrifying at the moment, so I'd like to nominate Zangoose from B+ to A- or A.
This thing is really getting on my nerves right now and plows through teams much easier now with Megalix gone. Unlike other fast sweepers will not be hindered by T-Wave or Wisp and will annihilate your omnipresent precious
Camel Rupties
252+ Atk Toxic Boost Zangoose Facade (140 BP) vs. 252 HP / 0 Def Mega Camerupt: 345-406 (100.2 - 118%) -- guaranteed OHKO
Mantines
252+ Atk Toxic Boost Zangoose Facade (140 BP) vs. 248 HP / 252+ Def Mantine: 312-367 (93.6 - 110.2%) -- 62.5% chance to OHKO
and
KlangKlings
252+ Atk Toxic Boost Zangoose Close Combat vs. 92 HP / 0 Def Klinklang: 350-414 (123.2 - 145.7%) -- guaranteed OHKO
and will
2 hit KO your bulky defenders such as
Rhydon
252+ Atk Toxic Boost Zangoose Close Combat vs. 252 HP / 0 Def Eviolite Rhydon: 226-266 (54.5 - 64.2%) -- guaranteed 2HKO
Musharna
252+ Atk Toxic Boost Zangoose Facade (140 BP) vs. 240 HP / 252+ Def Musharna: 276-325 (63.7 - 75%) -- guaranteed 2HKO after Leftovers recovery
Lorde Quaggles
252+ Atk Toxic Boost Zangoose Facade (140 BP) vs. 252 HP / 252+ Def Quagsire: 276-325 (70 - 82.4%) -- guaranteed 2HKO after Leftovers recovery
and
Regirock?
252+ Atk Toxic Boost Zangoose Close Combat vs. 252 HP / 0 Def Regirock: 214-254 (58.7 - 69.7%) -- guaranteed 2HKO after Leftovers recovery
The priority is also very nice doing a hefty 63.3 - 74.5% to Life Orb Sneasels trying to revenge it as well as bopping other frail and fast mons.
It is pretty scary at the moment and near impossible to switch in on without heavy predictions. Yes it's on a toxic orb timer, but likely by the time has run out (RIP if Mesp healing wish support) it has managed to do quite a bit of damage. Jolly can also be used over adamant to outspeed even more pokemon (Hp fire Lilligant, etc) while slightly reducing 1hitkoes on Mantine and Camerupt, but maintaining 2 hit Koes on all the counters.