Stats & Training
The stat bars tell the story: Defense carries everything and Sp. Atk's dead weight. But this Rock Snake Pokemon still yields 1 Defense EV per fight on a medium-fast 1M XP curve.
This chain of immense stones resembles a giant serpent. Tremors shake the earth above as it burrows deep beneath the ground, feeding on boulders as it goes.
Onix Weakness
Onix's Rock/Ground typing leaves it vulnerable to Water, Grass, Ice, Fighting, Ground, and Steel. Water and Grass hits land at 4x, so they're the biggest threat. It shrugs off Electric-type attacks completely. The Rock/Ground typing picks up 5 resistances to work with. Onix's physical bulk (base 160 Def) helps cushion physical weakness hits, but special attackers are the bigger threat.
| Damage | Types |
|---|---|
| 4x (Critical) | Water, Grass |
| 2x (Weak) | Ice, Fighting, Ground, Steel |
| 0.5x (Resist) | Normal, Fire, Flying, Rock |
| 0.25x (Resist) | Poison |
| 0x (Immune) | Electric |
 Pelipper Water | B | |
Available Moves Moves
Damage vs Onix View Pelipper builds →Hydro Pump 4x403-475%KO Brine 4x241-284%KO Water Pulse 4x222-262%KO Water Gun 4x153-180%KO | ||
 Hawlucha Fighting | B | |
Available Moves Moves
Damage vs Onix View Hawlucha builds →High Jump Kick 2x85-101%KO Flying Press 2x66-79% Brick Break 2x51-60% Karate Chop 2x35-41% | ||
 Decidueye GrassGhost | C | |
Obtain MethodEvolve Rowlet (Route 1 Gift) Available Moves Moves
Damage vs Onix View Decidueye builds →Leaf Storm 4x495-584%KO Leaf Blade 4x134-158%KO Razor Leaf 4x87-104%KO Leafage 4x65-76% | ||
 Cottonee GrassFairy | D | |
Available Moves Moves
Damage vs Onix View Cottonee builds →Solar Beam 4x222-262%KO Energy Ball 4x166-196%KO Giga Drain 4x139-164%KO Razor Leaf 4x36-44% | ||
 Petilil Grass | D | |
Available Moves Moves
Damage vs Onix View Petilil builds →Leaf Storm 4x375-442%KO Energy Ball 4x259-305%KO Giga Drain 4x217-256%KO Magical Leaf 4x175-207%KO | ||
In Ultra Sun & Ultra Moon, Cobalion's Close Combat hits Onix for 50-59%. Volcanion deals 38-44% with Fire Blast.
 Cobalion SteelFighting | A | |
Recommended Build AbilityJustified ItemFightiniumz NatureJolly Moves
Damage vs Onix View Cobalion builds →Close Combat 2x50-59% Stone Edge7-8% | ||
 Ferrothorn GrassSteel | A | |
Recommended Build AbilityIron Barbs ItemLeftovers NatureSassy Moves View Ferrothorn builds →
| ||
 Volcanion FireWater | A | |
Recommended Build AbilityWaterabsorb ItemChoice Specs NatureTimid Moves
Damage vs Onix View Volcanion builds →Sludge Bomb10-12% Fire Blast38-44% | ||
 Infernape FireFighting | A | |
Recommended Build AbilityBlaze ItemLife Orb NatureTimid Moves
Damage vs Onix View Infernape builds →Close Combat 2x52-61% Fire Blast28-33% | ||
 Mamoswine IceGround | A | |
Recommended Build AbilityThickfat ItemLife Orb NatureAdamant Moves
Damage vs Onix View Mamoswine builds →Earthquake 2x76-89% Ice Shard 2x31-37% Knock Off17-20% | ||
Ultra Sun & Ultra Moon Evolution
To get Steelix from Onix, you need a trade. The evolution method matters here. The evolved forms gain up to 125 total stats over Onix. View every chain in the Evolution Chart.
How to Evolve
Breeding
Breed Onix easily with 58 breeding partners from the Mineral egg group. Pass egg moves like Block, Defense Curl, Flail and 7 more to offspring.
Ultra Sun & Ultra Moon Onix Best Moveset
Weakarmor and Eviolite give Onix staying power beyond its evolution stage. Careful nature boosts Sp. Def, max HP and Sp. Def EVs set the spread, and the pre-evolution bulk actually works here.
Best Build
Onix best EVs are HP and Sp. Def
Doubles Bulky Support Moveset
- Rock Slide
- Earthquake
- Explosion
- Rage
Recommended Teammates
Support Moveset
- Toxic
- Stealth Rock
- Roar
- Protect
Recommended Teammates
Moves
The natural movepool does the job, but Block and Defense Curl from the egg pool give Onix something extra.
Level-Up Moves
TM Moves
Egg Moves
Tutor Moves
Transfer Moves
Ultra Sun & Ultra Moon Onix Locations
Onix starts showing up in early-game routes at moderate rates across 2 encounter spots. The list below is sorted so you can pick what fits your current progress without scrolling through everything.
Best Locations to Catch Onix in Ultra Sun & Ultra Moon
Onix Guide
At 385 BST, Onix is firmly in pre-evolution territory. Evolve it into Steelix before bringing it to any serious fight.
In Ultra Sun & Ultra Moon, watch for Starmie (Water), Exeggutor (Grass), and Cloyster (Ice) when using Onix. They all hit it super-effectively with STAB. Starmie is the most dangerous since Water moves deal 4x damage. Fighting, Ground, and Steel-type attackers are also a problem. With 6 weakness types, most competitive teams carry at least one counter.
Rock Head protects against recoil damage. That's the one you want on Onix. Weak Armor is the hidden ability. Niche, but it has its uses. Sturdy works too if your team needs something different.
Onix is a physical attacker with base 45 Attack. Enough bulk to take a hit or two, too. Speed tells the real story. Base 70 Speed is workable. Faster than some, slower than many.
In Ultra Sun & Ultra Moon, For a casual playthrough, Onix works as a placeholder. Rock/Ground coverage is useful early. The real payoff is Steelix. That's where the stats start mattering.
Game Availability
Present since Red & Blue, Onix appears in 21 games spanning 10 generations. Gen 1 originals like Onix have the longest track record of availability in the series.
Click a game to view version-specific details
- Gen 1Y
Yellow - Gen 1RBDebut
Red & Blue - Gen 2GS
Gold & Silver - Gen 2C
Crystal - Gen 3RS
Ruby & Sapphire - Gen 3FRLG
FireRed & LeafGreen - Gen 3E
Emerald - Gen 4Pt
Platinum - Gen 4HGSS
HeartGold & SoulSilver - Gen 4DP
Diamond & Pearl - Gen 5BW
Black & White - Gen 5B2W2
Black 2 & White 2 - Gen 6XY
X & Y - Gen 6ORAS
Omega Ruby & Alpha Sapphire - Gen 7USUM
Ultra Sun & Ultra Moon - Gen 7SM
Sun & Moon - Gen 7LGPE
Let's Go Pikachu & Eevee - Gen 8SwSh
Sword & Shield - Gen 8PLA
Legends: Arceus - Gen 8BDSP
Brilliant Diamond & Shining Pearl - Gen 9SV
Scarlet & Violet - Gen 9LZA
Legends: Z-A - Gen 10WW
Winds & Waves