At 385 BST, Onix is firmly in pre-evolution territory. Evolve it into Steelix before bringing it to any serious fight.

What is Onix weak to?

In Legends: Arceus, 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.

What is the best ability for Onix?

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.

What role does Onix play in battle?

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 Legends: Arceus, 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.

Onix - Weakness, Evolution, Moveset, EVs & Stats

Physical

Balanced

CTier

70Speed · Below Avg

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.

Base Stats

Avg

HP35

Attack45

Defense160

Sp. Atk30

Sp. Def45

Speed70

Total385

Details

Catch Rate

Challenging45 / 255

Growth Rate

Medium Fast1M XP

Height8.8 m

Weight210.0 kg

Base XP77

Abilities

Rock HeadTop Pick

Protects against recoil damage.

Sturdy

Prevents being KOed from full HP, leaving 1 HP instead. Protects against the one-hit KO moves regardless of HP.

Weak ArmorHA

Raises Speed and lowers Defense by one stage each upon being hit by a physical move.

EV Yield

HPAtkDef+1SpASpDSpe

Defense training source

Pokedex Entries

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.

Legends: Arceus

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.

Onix Weakness and Resistance Chart
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

Type ChartFragile

6Weak

5Resist

1Immune

Score-7

4xCritical

Water Grass

2xWeak

Ice Fighting Ground Steel

½xResist

Normal Fire Flying Rock

¼xResist

Poison

0xImmune

Electric

STAB (8)

Fire Ice Flying Bug Electric Poison Rock Steel

How to Beat Onix in Legends: Arceus (Best Counters)

Tangrowth Grass	A
Available Move Moves AbsorbLv. 1 Damage vs Onix Absorb 4x 100-120%KO View Tangrowth builds →
Leafeon Grass	A
Available Move Moves LeafageLv. 1 Damage vs Onix Leafage 4x 100-120%KO View Leafeon builds →
Gyarados WaterFlying	B
Available Move Moves Water PulseLv. 1 Damage vs Onix Water Pulse 4x 175-210%KO View Gyarados builds →
Gastrodon WaterGround	B
Available Move Moves Mud-SlapLv. 1 Damage vs Onix Mud-Slap 2x 50-60% View Gastrodon builds →
Shaymin Grass	C
Obtain MethodFloaro Gardens Interact Encounter Available Move Moves LeafageLv. 1 Damage vs Onix Leafage 4x 100-120%KO View Shaymin builds →

Legends: Arceus 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

2 Forms

#095Onix

Trade + Metal Coat

#208Steelix

Stat Comparison 2 Stages

Onix

RockGround

Steelix

SteelGround

75+40

ATK

85+40

DEF

160

200+40

SP.ATK

55+25

SP.DEF

65+20

SPE

30-40

BST

385C-Tier

510C-Tier+125

ROLE

Balanced

Trick Room

TYPE

Utility

Physical

Breeding is not available in this game

Legends: Arceus Onix Best Moveset

Onix doesn't rely on pure speed. Leftovers gives it passive recovery each turn to stay healthy, and Naive nature still pushes offense. Earthquake and the remaining moves keep the pressure on while max Sp. Atk and Speed EVs balance power and survivability.

Best Build

Legends: Arceus uses different battle mechanics.

Competitive build content is not applicable for this game. Select a main series game for builds.

Moves

A compact toolkit overall. The offense runs through Stone Edge and High Horsepower for Onix, with Normal and Steel coverage doing what it can. Don't expect versatility from this one.

Level-Up Moves

Lv 1

Rollout

—309020Rock

Lv 6

Tackle

D4010035Normal

Lv 11

Bulldoze

D6010020Ground

Lv 18

Rock Slide

D759010Rock

Lv 25

Stealth Rock

C——20Rock

Lv 34

High Horsepower

C959510Ground

Lv 43

Iron Tail

D1007515Steel

TM Moves

Onix can't learn any TM moves

Egg Moves

Onix doesn't have any Egg moves

Tutor Moves

Tut

Tutor

Bulldoze

D6010020Ground

Tutor

Earth Power

D9010010Ground

Tutor

Flash Cannon

S8010010Steel

Tutor

High Horsepower

C959510Ground

Tutor

Iron Head

D8010015Steel

Tutor

Iron Tail

D1007515Steel

Tutor

Power Shift

———10Normal

Tutor

Rest

S——10Psychic

Tutor

Rock Slide

D759010Rock

Tutor

Rock Smash

D4010015Fighting

Tutor

Stealth Rock

C——20Rock

Tutor

Stone Edge

D100805Rock

Legends: Arceus Onix Locations

Onix starts showing up in mid-game routes at decent spawn rates across 4 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 Legends: Arceus

Walking encounters at walking across 4 spots for Onix. Sorted by progression so you can see what's reachable at your current point in the game.

Bolderoll Slope

Grass

Uncommon

Celestica Trail

Grass Route

Uncommon

Lake Valor

Grass Water

Uncommon

Scarlet Bog

Grass Swamp

Uncommon

Onix Guide

At 385 BST, Onix is firmly in pre-evolution territory. Evolve it into Steelix before bringing it to any serious fight.
In Legends: Arceus, 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 Legends: Arceus, 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

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Heatran FireSteel	S
Recommended Build AbilityFlashfire ItemLeftovers NatureTimid Moves Earth Power Magma Storm Stealth Rock TauntUtility View Heatran builds →
Weavile DarkIce	A
Recommended Build AbilityPressure ItemHeavy-Duty Boots NatureJolly Moves Knock Off Ice Shard Triple Axel Swords Dance Damage vs Onix Knock Off 32-37% Ice Shard 2x 40-47% View Weavile builds →