While most trainers evolve Lairon into Aggron immediately, the unevolved form has a niche with Eviolite boosting its defenses. Poison moves can't touch it, and only 3 types hit it super-effectively. The stat spread favors raw physical power.
The stat bars tell the story: Defense carries everything and Speed's dead weight. But this Iron Armor Pokemon still yields 2 Defense EVs per fight on a slow 1.25M XP grind.
LAIRON tempers its steel body by drinking highly nutritious mineral springwater until it is bloated. This POKéMON makes its nest close to springs of delicious water.
LAIRON feeds on iron contained in rocks and water. It makes its nest on mountains where iron ore is buried. As a result, the POKéMON often clashes with humans mining the iron ore.
Lairon Weakness
GoodFighting, Ground, and Water-type moves hit Lairon for super-effective damage. Fighting and Ground hits land at 4x, so they're the biggest threat. The upside? Poison-type moves can't touch it at all. It resists 9 types, so it can switch into a lot of moves safely. Lairon's physical bulk (base 140 Def) helps cushion physical weakness hits, but special attackers are the bigger threat.
- Dark and Steel types added — Fairy does not exist yet
- Moves are Physical or Special based on type, not per move
Lairon sits between Aron and Aggron in this three-stage line. Not the final form yet. For breeding, slow to hatch with a decent partner pool via one egg group. So far, Defense got the biggest boost (+40 from Aron). The final form adds another 100 stats on top.
How to Evolve
Breed with Lairon to get Aron eggs using 49 partners from the Monster egg group. Notable egg moves include Body Slam, Endeavor, Smelling Salts and 1 more.
Best Build
No build content available for this Pokemon in Gen 3.
Try selecting a different game/generation filter, or check back later.
Don't skip the egg moves. Lairon picks up Body Slam and Endeavor only through breeding, and both fill gaps the natural movepool can't. STAB runs through Iron Tail and Rock Tomb while Normal and Ground coverage and more adds range.
Level-Up Moves
TM Moves
Egg Moves
Tutor Moves
decent spawn rates for Lairon across 6 locations in late-game routes. Nothing complicated. Check the sorted list below, compare the top few options, and head to whichever is closest.
Where To Catch Lairon in Ruby & Sapphire
The path to Lairon starts with Aron at Lv. 7-44 via walking encounters. 2 catchable stages total, with locations listed for each one below.
Step 1Catch AronEFFORTLESSGranite Cave - B1FRubyGrassLv.9-11CommonEarlyCaveEFFORTLESSGranite Cave - B1FSapphireGrassLv.9-11CommonEarlyCaveEFFORTLESSGranite Cave - B2FSapphireGrassLv.10-12CommonEarlyCaveEFFORTLESSGranite Cave - B2FRubyGrassLv.10-12CommonEarlyCaveEASYGranite Cave - 1F Room 2RubyGrassLv.7-8UncommonEarlyCaveEASYGranite Cave - 1F Room 2SapphireGrassLv.7-8UncommonEarlyCaveCHALLENGINGVictory Road - 1FSapphireGrassLv.36-40RareLateCaveCHALLENGINGVictory Road - 1FRubyGrassLv.36-40RareLateCave
Step 2Lairon ✓EASYVictory Road - 1FRubyGrassLv.40UncommonLateCaveEASYVictory Road - 1FSapphireGrassLv.40UncommonLateCaveEASYVictory Road - B1FRubyGrassLv.40-42UncommonLateCaveEASYVictory Road - B1FSapphireGrassLv.40-42UncommonLateCaveEASYVictory Road - B2FSapphireGrassLv.40-44UncommonLateCaveEASYVictory Road - B2FRubyGrassLv.40-44UncommonLateCaveor evolve from Aron (Step 1)
At 430 BST, Lairon is firmly in pre-evolution territory. Evolve it into Aggron before bringing it to any serious fight.
Watch for Blaziken (Fighting), Swampert (Ground), and Starmie (Water) when using Lairon. They all hit it super-effectively with STAB. Blaziken is the most dangerous since Fighting moves deal 4x damage. At base 40 Speed, Lairon won't outrun any of these threats so switching to a resist is usually the safer play.
Sturdy prevents being KOed from full HP, leaving 1 HP instead — that's the one you want on Lairon. Heavy Metal is the hidden ability. Niche, but it has its uses. Rock Head works too if your team needs something different.
Lairon is a physical attacker with base 90 Attack. Enough bulk to take a hit or two, too. But the speed tells the real story — base 40 Speed is low. Priority moves or Trick Room are the way to go. Fits the trick room role.
Lairon appears in 15 games, including Ruby & Sapphire, FireRed & LeafGreen, and Emerald.
Debuting in Ruby & Sapphire, Lairon appears in 15 games across 7 generations. A reliable presence in most mainline games, typically found through catching or hatching as a base form.
- Gen IY
Yellow - Gen IRB
Red & Blue - Gen IIGS
Gold & Silver - Gen IIC
Crystal - Gen IIIRSDebut
Ruby & Sapphire - Gen IIIFRLG
FireRed & LeafGreen - Gen IIIE
Emerald - Gen IVPt
Platinum - Gen IVHGSS
HeartGold & SoulSilver - Gen IVDP
Diamond & Pearl - Gen VBW
Black & White - Gen VB2W2
Black 2 & White 2 - Gen VIXY
X & Y - Gen VIORAS
Omega Ruby & Alpha Sapphire - Gen VIIUSUM
Ultra Sun & Ultra Moon - Gen VIISM
Sun & Moon - Gen VIILGPE
Let's Go Pikachu & Eevee - Gen VIIISwSh
Sword & Shield - Gen VIIIPLA
Legends: Arceus - Gen VIIIBDSP
Brilliant Diamond & Shining Pearl - Gen IXSV
Scarlet & Violet - Gen IXLZA
Legends: Z-A