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.
It usually lives underground. It searches for food while boring its way through the ground at 50 miles per hour.
As it grows, the stone portions of its body harden to become similar to black-colored diamonds.
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 |
- Dark and Steel types added — Fairy does not exist yet
- Moves are Physical or Special based on type, not per move
 Oddish GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Oddish builds →Bullet Seed 4x83-100%KO Absorb 4x71-86% | ||
 Bulbasaur GrassPoison | D | |
Obtain MethodPallet Town Gift Available Moves Moves
Damage vs Onix View Bulbasaur builds →Vine Whip 4x133-157%KO Bullet Seed 4x83-100%KO | ||
 Bellsprout GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Bellsprout builds →Vine Whip 4x133-157%KO Bullet Seed 4x83-100%KO | ||
 Paras BugGrass | D | |
Available Moves Moves
Damage vs Onix View Paras builds →Dig 2x31-38% Bullet Seed 4x71-86% | ||
 Squirtle Water | D | |
Obtain MethodPallet Town Gift Available Moves Moves
Damage vs Onix View Squirtle builds →Dig 2x26-33% Waterfall 4x181-214%KO Water Pulse 4x145-171%KO Bubble 4x95-114%KO | ||
Oddish GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Oddish builds →Bullet Seed 4x83-100%KO Absorb 4x71-86% | ||
Bulbasaur GrassPoison | D | |
Obtain MethodPallet Town Gift Available Moves Moves
Damage vs Onix View Bulbasaur builds →Vine Whip 4x133-157%KO Rock Smash 2x14-19% Bullet Seed 4x83-100%KO | ||
Bellsprout GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Bellsprout builds →Vine Whip 4x133-157%KO Bullet Seed 4x83-100%KO | ||
Paras BugGrass | D | |
Available Moves Moves
Damage vs Onix View Paras builds →Dig 2x31-38% Rock Smash 2x19-24% Bullet Seed 4x71-86% | ||
Squirtle Water | D | |
Obtain MethodPallet Town Gift Available Moves Moves
Damage vs Onix View Squirtle builds →Dig 2x26-33% Waterfall 4x181-214%KO Brick Break 2x24-29% Water Pulse 4x145-171%KO | ||
Oddish GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Oddish builds →Giga Drain 4x216-256%KO Bullet Seed 4x82-97% Absorb 4x66-79% | ||
Bulbasaur GrassPoison | D | |
Obtain MethodPallet Town Gift Available Moves Moves
Damage vs Onix View Bulbasaur builds →Giga Drain 4x194-229%KO Razor Leaf 4x150-176%KO Vine Whip 4x119-141%KO Rock Smash 2x15-18% | ||
Bellsprout GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Bellsprout builds →Giga Drain 4x209-247%KO Vine Whip 4x126-150%KO Bullet Seed 4x75-88% | ||
Paras BugGrass | D | |
Available Moves Moves
Damage vs Onix View Paras builds →Dig 2x29-35% Giga Drain 4x157-185%KO Rock Smash 2x16-21% Bullet Seed 4x59-71% | ||
Squirtle Water | D | |
Obtain MethodPallet Town Gift Available Moves Moves
Damage vs Onix View Squirtle builds →Iron Tail 2x29-35% Ice Beam 2x65-76% Dig 2x25-29% Waterfall 4x172-203%KO | ||
 Parasect BugGrass | C | |
Available Moves Moves
Damage vs Onix View Parasect builds →Dig 2x37-45% Giga Drain 4x193-229%KO Rock Smash 2x20-24% Bullet Seed 4x74-87% | ||
 Exeggcute GrassPsychic | D | |
Available Moves Moves
Damage vs Onix View Exeggcute builds →Giga Drain 4x193-229%KO Bullet Seed 4x74-87% | ||
 Gloom GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Gloom builds →Giga Drain 4x254-300%KO Bullet Seed 4x93-111%KO Absorb 4x74-87% | ||
 Weepinbell GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Weepinbell builds →Giga Drain 4x254-300%KO Vine Whip 4x154-182%KO Bullet Seed 4x93-111%KO | ||
Bulbasaur GrassPoison | D | |
Obtain MethodPallet Town Gift Available Moves Moves
Damage vs Onix View Bulbasaur builds →Giga Drain 4x208-245%KO Razor Leaf 4x154-182%KO Vine Whip 4x126-150%KO Rock Smash 2x13-16% | ||
Parasect BugGrass | C | |
Available Moves Moves
Damage vs Onix View Parasect builds →Dig 2x37-45% Giga Drain 4x193-229%KO Rock Smash 2x20-24% Bullet Seed 4x74-87% | ||
Exeggcute GrassPsychic | D | |
Available Moves Moves
Damage vs Onix View Exeggcute builds →Giga Drain 4x193-229%KO Bullet Seed 4x74-87% | ||
Gloom GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Gloom builds →Giga Drain 4x254-300%KO Bullet Seed 4x93-111%KO Absorb 4x74-87% | ||
Weepinbell GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Weepinbell builds →Giga Drain 4x254-300%KO Vine Whip 4x154-182%KO Bullet Seed 4x93-111%KO | ||
Bulbasaur GrassPoison | D | |
Obtain MethodPallet Town Gift Available Moves Moves
Damage vs Onix View Bulbasaur builds →Giga Drain 4x208-245%KO Razor Leaf 4x154-182%KO Vine Whip 4x126-150%KO Rock Smash 2x13-16% | ||
Parasect BugGrass | C | |
Available Moves Moves
Damage vs Onix View Parasect builds →Solar Beam 4x299-352%KO Dig 2x36-42% Giga Drain 4x186-219%KO Rock Smash 2x19-23% | ||
 Lapras WaterIce | C | |
Obtain MethodSilph Co Gift Available Moves Moves
Damage vs Onix View Lapras builds →Blizzard 2x179-211%KO Iron Tail 2x40-48% Ice Beam 2x147-173%KO Surf 4x294-346%KO | ||
 Dewgong WaterIce | C | |
Obtain MethodSeafoam Islands Surfing Available Moves Moves
Damage vs Onix View Dewgong builds →Blizzard 2x154-182%KO Ice Beam 2x127-150%KO Surf 4x255-300%KO Waterfall 4x225-265%KO | ||
Exeggcute GrassPsychic | D | |
Available Moves Moves
Damage vs Onix View Exeggcute builds →Solar Beam 4x299-352%KO Giga Drain 4x186-219%KO Bullet Seed 4x68-81% | ||
Gloom GrassPoison | D | |
Available Moves Moves
Damage vs Onix View Gloom builds →Petal Dance 4x387-456%KO Solar Beam 4x387-456%KO Giga Drain 4x245-288%KO Bullet Seed 4x88-104%KO | ||
 Tangela Grass | C | |
Available Moves Moves
Damage vs Onix View Tangela builds →Solar Beam 4x458-540%KO Giga Drain 4x287-338%KO Vine Whip 4x175-207%KO Mega Drain 4x157-185%KO | ||
Parasect BugGrass | C | |
Available Moves Moves
Damage vs Onix View Parasect builds →Solar Beam 4x305-360%KO Dig 2x36-44% Giga Drain 4x195-229%KO Rock Smash 2x20-24% | ||
Lapras WaterIce | C | |
Obtain MethodSilph Co Gift Available Moves Moves
Damage vs Onix View Lapras builds →Hydro Pump 4x371-436%KO Blizzard 2x185-218%KO Iron Tail 2x41-49% Ice Beam 2x150-177%KO | ||
Dewgong WaterIce | C | |
Obtain MethodSeafoam Islands Surfing Available Moves Moves
Damage vs Onix View Dewgong builds →Blizzard 2x159-188%KO Ice Beam 2x129-153%KO Surf 4x259-305%KO Waterfall 4x232-273%KO | ||
Exeggcute GrassPsychic | D | |
Available Moves Moves
Damage vs Onix View Exeggcute builds →Solar Beam 4x305-360%KO Giga Drain 4x195-229%KO Bullet Seed 4x69-82% | ||
In FireRed & LeafGreen, Starmie threatens a KO with Surf (437-515%). Claydol deals 73-87% with Earthquake.
 Magneton ElectricSteel | A | |
Recommended Build AbilityMagnetpull ItemMagnet NatureModest Moves View Magneton builds →
| ||
 Starmie WaterPsychic | A | |
Recommended Build AbilityNatural Cure ItemLeftovers NatureTimid Moves
Damage vs Onix View Starmie builds →Rapid Spin4-5% Ice Beam 2x145-172%KO Surf 4x437-515%KO | ||
 Claydol GroundPsychic | A | |
Recommended Build AbilityLevitate ItemLeftovers NatureAdamant Moves
Damage vs Onix View Claydol builds →Rapid Spin6-7% Earthquake 2x73-87% Explosion30-36% Psychic61-72% | ||
 Heracross BugFighting | B | |
Recommended Build AbilitySwarm ItemSalacberry NatureJolly Moves
Damage vs Onix View Heracross builds →Megahorn60-71% Rock Slide12-15% | ||
 Breloom GrassFighting | B | |
Recommended Build AbilityEffect Spore ItemLeftovers NatureJolly Moves
Damage vs Onix View Breloom builds →Mach Punch 2x42-50% | ||
FireRed & LeafGreen 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 23 breeding partners from the Mineral egg group. Pass egg moves like Block, Explosion, Flail and 1 more to offspring.
FireRed & LeafGreen Onix Best Moveset
Best Build
No build content available for this Pokemon in Gen 3.
Try selecting a different game/generation filter, or check back later.
Moves
The natural movepool does the job, but Block and Explosion from the egg pool give Onix something extra. Pair those with Earthquake and Dig for STAB and Normal and Dragon coverage and more for reach, and the kit fills out nicely.
Level-Up Moves
TM Moves
Egg Moves
Tutor Moves
FireRed & LeafGreen Onix Locations
Onix's scattered across 12 spots in early-game routes with high spawn rates. Check the list below for the closest location to wherever you are in the game. This one's quick.
Best Locations to Catch Onix in FireRed & LeafGreen
walking encounters for Onix across 12 spots at Lv. 13-54. The catch is that FireRed and LeafGreen don't share every location, so compare what's available in your version.
Onix Guide
At 385 BST, Onix is firmly in pre-evolution territory. Evolve it into Steelix before bringing it to any serious fight.
In FireRed & LeafGreen, 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 FireRed & LeafGreen, 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