Moves
Earth Power is Nidoking's most spammable STAB move and hits Pokemon like Heatran, Magnezone, Bisharp, and Metagross before it Mega Evolves. Sludge Wave is slightly more powerful and hits Fairy-types such as Clefable, Mega Altaria, Gardevoir before it Mega Evolves, and Sylveon. It also hits Grass-types such as Breloom and has great coverage alongside Earth Power. Ice Beam allows Nidoking to OHKO Garchomp, Gliscor, and Landorus-T and 2HKO Hippowdon. Flamethrower hits Steel-types such as Skarmory, Ferrothorn, and Mega Scizor. Flamethrower is powerful enough that Fire Blast isn't recommended. Sucker Punch can be used to OHKO Mega Alakazam after prior damage and Gengar with no prior damage and helps pick off weakened Pokemon like Latios and Latias. Sucker Punch should be run over Flamethrower, as Earth Power already deals huge damage to Flamethrower's targets outside of Skarmory.
Set Details
Maximum Special Attack investment maximizes Nidoking's damage output, while maximum Speed investment allows Nidoking to Speed tie with Heracross and outspeed the likes of bulky Garchomp, Heatran, Mega Altaria, Gardevoir before it Mega Evolves, and Adamant Excadrill. Life Orb along with Sheer Force boosts Nidoking's power to incredible levels. Sheer Force also negates Life Orb recoil on attacks with secondary effects, giving Nidoking more longevity than other wallbreakers. If running Sucker Punch, a Naive nature with 16 Attack EVs should be run to guarantee the OHKO on Mega Alakazam with Stealth Rock on the field.
Usage Tips
Because Nidoking lacks bulk, it struggles to switch into a lot of Pokemon easily and appreciates free switches provided by Volt Switch or U-turn support and double switches. However, Nidoking can easily switch into Clefable and pressure its team immensely, which is Nidoking's main advantage over other wallbreakers. When Nidoking is on the field against slower teams, just use the appropriate coverage move, and against faster teams, use the appropriate coverage move to hit faster Pokemon such as Choice Scarf Landorus-T, Mega Metagross, Latios, and Gengar that can switch into at least one of Nidoking's STAB moves when they switch in.
Team Options
Because Nidoking struggles to switch into a lot of threats, it appreciates having Volt Switch or U-turn support. Defensive Landorus-T is immune to the Ground-type moves that threaten Nidoking and helps with Nidoking's bad matchup against sand teams, while Nidoking is capable of breaking a lot of Pokemon that check it such as Ferrothorn, Garchomp, and bulky Water-types in general. Tornadus-T is capable of checking fast Water- and Grass-types such as Keldeo and Serperior. Raikou can help check faster Electric-types such as Mega Manectric, Thundurus, and opposing Raikou, as they all deal heavy damage to Nidoking with Hidden Power Ice. Raikou also helps check the likes of Gengar if Nidoking lacks Sucker Punch, as well as checking Keldeo and Talonflame. Klefki and Ferrothorn are capable of using Spikes to capitalize on Nidoking's wallbreaking ability and Thunder Wave to provide speed control and slow down faster Pokemon, allowing Nidoking to pick them off more easily. Klefki is notable for its ability to switch into Weavile and force it out. Though it lacks Spikes, Clefable can spread paralysis too, and it can pressure teams with the threat of a Calm Mind sweep thanks to Nidoking's ability to remove Steel-types for it. Tank Garchomp punishes powerful priority moves and helps weaken Pokemon by phazing them with Dragon Tail. Latias can switch into Electric-types and Keldeo and can provide Healing Wish support, which helps Nidoking if it gets worn down too quickly.
Mega Lopunny, Mega Alakazam, Mega Manectric, Bisharp, and Weavile are all capable of pressuring offensive teams, which Nidoking doesn't have a decent matchup against, while Nidoking helps break bulkier Pokemon for said sweepers. Mega Manectric forces a lot of switches and provides Volt Switch support for Nidoking, while Nidoking can weaken Hippowdon, a notable counter to Mega Manectric. Mega Alakazam is also notable for its ability to handle weather teams with Trace. Pokemon weak to Clefable such as Latios appreciate having Clefable weakened so that it can be picked off easily. Substitute + Swords Dance Garchomp appreciates having Unaware Clefable weakened and Togekiss removed because they are both capable of walling it. Mega Scizor and Talonflame appreciate bulky Ground-types being weakened, while Nidoking appreciates their good matchups against offensive teams. Pokemon like Azumarill and Breloom are also good teammates for their ability to OHKO Excadrill and beat Hippowdon. Pokemon like Talonflame, Azumarill, Klefki, Ferrothorn, and Bisharp have great matchups against rain teams, which trouble Nidoking heavily. Fighting-types such as Terrakion, Keldeo, and Breloom are all capable of breaking Chansey, which walls Nidoking completely. Fairy- and Dark-types such as Mega Gardevoir, Mega Altaria, Clefable, Bisharp, and Weavile are capable of handling bulky Dragon-types that can wall Nidoking such as Mega Latias.