How to Evolve Nidoran♂

Nidoran♂ follows a linear, two-stage evolution line that requires both experience points and an evolutionary item. The first phase triggers automatically when the Pokémon reaches level 16. You can achieve this via wild encounters, trainer battles, EXP Candies, or a Rare Candy. Once the level-up animation concludes, you obtain Nidorino, upgrading its Base Stat Total (BST) from 273 to 365.

The second phase requires a Moon Stone. Unlike level-based evolutions, stone evolutions can be triggered at any time. You must open your bag, select the Moon Stone, and use it directly on Nidorino. This instantly initiates the evolution into Nidoking, pushing its BST to a final 505. Trading is never required for this evolution line.

Players can cancel the first evolution to Nidorino by pressing the B button during the animation. Doing so forces Nidoran♂ to level up faster due to the experience scaling mechanics in certain generations, but it delays the significant stat boosts required for mid-game battles.

Securing a Moon Stone is the primary bottleneck for obtaining a Nidoking early in a playthrough. In Generation 1 (Red, Blue, Yellow) and their Generation 3 remakes (FireRed, LeafGreen), Moon Stones are easily found as hidden or visible items inside Mt. Moon. This allows players to acquire a fully evolved Nidoking before the second Gym badge.

In Generation 2 (Gold, Silver, Crystal) and Generation 4 (HeartGold, SoulSilver), Moon Stones are scarcer. Players must wait until the Ruins of Alph, rely on their mother buying one with saved money, or purchase them at the Pokéathlon Dome on Mondays using 3,000 Athlete Points. Generation 3 (Ruby, Sapphire, Emerald) requires players to use the move Thief on wild Lunatone, which hold the item 5% of the time.

In Generation 8 (Sword and Shield), Moon Stones spawn daily in the Dusty Bowl section of the Wild Area. Players can also pay the Digging Duo near the Pokémon Nursery in Bridge Field for a chance to excavate one. Nidoran♂ is currently unavailable in Generation 9 (Scarlet and Violet).

Historically, stone evolutions carry a severe penalty: the fully evolved Pokémon stops learning most moves via level-up. If you use a Moon Stone on Nidorino at level 16 in Generations 1 through 7, Nidoking will miss out on learning Poison Jab naturally at level 43. Players must rely heavily on Technical Machines (TMs) to build a viable moveset if they evolve Nidorino immediately.

Generation 8 completely overhauled this mechanic. The Move Reminder inside every Pokémon Center allows fully evolved Pokémon to "remember" any move from their pre-evolutions' level-up pools, regardless of the level they evolved. In Sword and Shield, the optimal strategy is to use the Moon Stone immediately at level 16 to capitalize on Nidoking's superior stats, then visit the Move Reminder to curate its moveset.

For older games, players face a choice: delay the evolution to secure specific physical attacks, or evolve early and spend valuable, single-use TMs like Earthquake and Ice Beam to compensate for the barren level-up pool.

Pokedex.me, your unofficial fan-site, rates Nidoking an 8.5/10 in competitive formats where it is legal (such as Gen 8 UU or National Dex). Despite its physical design and higher base Attack (102), Nidoking operates almost exclusively as a Special Wallbreaker. This is entirely due to its Hidden Ability, Sheer Force, which removes the secondary effects of attacks to boost their base power by 30%.

When Sheer Force is combined with a Life Orb, the mechanics interact uniquely: Nidoking receives the 30% damage boost from the Life Orb but takes zero recoil damage from attacks that have secondary effects. This effectively grants Nidoking a 1.69x multiplier on its Special attacks without any HP penalty. Base 85 Special Attack becomes devastating under these conditions.

The standard competitive moveset leverages Nidoking's absurd special movepool. Sludge Wave and Earth Power serve as mandatory STAB (Same Type Attack Bonus) options. Ice Beam provides critical coverage against Ground and Flying-types like Landorus-Therian and Gliscor. Flamethrower rounds out the set to melt Steel-types like Corviknight and Ferrothorn that otherwise resist its STAB moves.

Nidoking excels at dismantling defensive cores. Its Poison/Ground typing grants it an immunity to Electric-type attacks and Thunder Wave, while simultaneously allowing it to absorb Toxic Spikes simply by switching into the field. It cannot be poisoned, making it a nightmare for stall teams that rely on passive damage to win.

However, Nidoking suffers from distinct flaws. A base Speed of 85 is highly competitive but ultimately falls short of the crucial base 100 benchmark, leaving it outpaced by common threats like Garchomp, Latios, and Hydreigon. Furthermore, its defensive bulk sits at a mediocre 81 HP, 77 Defense, and 85 Special Defense. Nidoking cannot safely switch into neutral offensive attacks and will quickly fall to any strong Water, Ground, Psychic, or Ice-type move.

To maximize Nidoking's potential, it requires teammates that provide safe entry. Slow pivots are essential. Corviknight using a slow U-turn, or Clefable utilizing Teleport, can absorb enemy attacks and bring Nidoking onto the field unscathed. Once positioned safely, Nidoking’s unresisted coverage forces the opponent to sacrifice a Pokémon.

Beyond standard competitive play, Nidoking holds legendary status in the speedrunning community, specifically for Pokémon Red and Blue. The strategy hinges on catching a Nidoran♂ early on Route 22. Players level it to 16 in Mt. Moon to trigger the Nidorino evolution, then immediately apply the hidden Moon Stone found on the same floor.

At level 23, Nidoking learns Thrash. In Generation 1, Thrash is a 90 Base Power move that lasts for 3 to 4 turns, effectively allowing Nidoking to one-shot almost every trainer's Pokémon through the mid-game without requiring the player to select a move each turn. This saves crucial seconds menuing.

In the late game, speedrunners exploit Generation 1's broken X Accuracy item, which bypasses all accuracy checks. By combining X Accuracy with Horn Drill (a One-Hit KO move Nidoking learns via TM07), Nidoking can systematically execute the Elite Four and Champion's teams, cementing its legacy as the undisputed king of Kanto speedruns.