Latias @ Dragonium Z/Life Orb
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Calm Mind
- Draco Meteor
- Psyshock
- Roost
Latias is a hard
check to Nidoking because it can always switch in at least once on any move, and threaten to outspeed and KO Nidoking in one hit with either Dragonium or Life Orb STABS, even non-Life Orb psyshock will KO after minimal chip.
252 SpA Latias Devastating Drake (195 BP) vs. 0 HP / 0 SpD Nidoking: 358-423 (118.1 - 139.6%) -- guaranteed OHKO
252 SpA Life Orb Latias Psyshock vs. 0 HP / 4 Def Nidoking: 374-445 (123.4 - 146.8%) -- guaranteed OHKO
252 SpA Life Orb Latias Draco Meteor vs. 0 HP / 0 SpD Nidoking: 312-368 (102.9 - 121.4%) -- guaranteed OHKO
252 SpA Latias Psyshock vs. 0 HP / 4 Def Nidoking: 288-342 (95 - 112.8%) -- guaranteed OHKO after Stealth Rock
It can even roost on a predicted switch to come back and fight Nidoking again later, but what stops Latias from being a full counter is that Nidoking's Sludge Wave and Ice Beam can outdamage roost, meaning that if it switches and you recover, you won't break even on HP and King can wear you down over time. But Lati is still a pretty solid check.
252 SpA Life Orb Sheer Force Nidoking Sludge Wave vs. 0 HP / 4 SpD Latias: 157-187 (52.1 - 62.1%) -- guaranteed 2HKO
252 SpA Life Orb Sheer Force Nidoking Ice Beam vs. 0 HP / 4 SpD Latias: 200-237 (66.4 - 78.7%) -- guaranteed 2HKO
These sting pretty bad on paper, of course. But Latias always outspeeds and OHKOs in return. Not to mention that coming in on Earth Power is completely free if you can call it.