#0304 · Hoenn · Generation 3

Aron

Iron Armor Pokémon · Steel/Rock-type

Aron is a Steel/Rock-type Pokémon, the Iron Armor Pokémon, number 304 (#0304) in the National Pokédex. It was introduced in Generation 3 and comes from the Hoenn region. It is 0.4 m tall and weighs 60 kg.

Aron is the Iron Armor Pokémon, a small Steel and Rock type that builds its body out of iron ore and, when hungry, eats railway tracks. Every time it evolves it sheds its armour and grows a new set, and people once collected the old plates.

How to pronounce Aron

Aron is pronounced AIR-un. The capital letters show the stressed syllable.

Listen to Aron said out loud:

In Japanese it is ココドラ (Cokodora).

Hear every other name on the Pokémon pronunciation guide.

Lore

Biology

Aron is a black, four-legged Pokémon, 0.4 m tall and 60 kg, covered in platinum-coloured steel plates over its head, back and legs. Small gaps in the armour leave room for its pale blue eyes, and a single blunt spike sticks up from its back. The Pokédex says one all-out charge can demolish a heavy dump truck.

Behaviour

Aron is usually found deep in the mountains. Hunger is what changes that: when ore runs short it comes down and eats bridges and rails, and people treat it as a pest. Its discarded armour is another story, since the Pokédex says people have collected it since ancient times.

Habitat

The Pokédex lists Aron as a mountain Pokémon. In Legends: Z-A it is found in Magenta District's Wild Zone 14 and, in the Mega Dimension DLC, in Hyperspace Lumiose.

Diet

Iron ore dug out of mountains, which it uses to make its steel body.

Powers

Its Abilities are Sturdy, which stops it being knocked out from full health in one hit, and Rock Head, which prevents recoil damage; Heavy Metal, which doubles its weight, is hidden. It hits with Metal Claw and Iron Head, and Harden toughens it up. It is a slow wall: base Defense 100 against Speed 30.

Name origin

Aron may combine 'armour' and 'iron'. The Japanese name is Cokodora (ココドラ), which may blend kōdō ('mining tunnel'), ko ('small' or 'child') and Kodora, the Japanese name of Lairon.

Design inspiration

Bulbapedia suggests Aron may draw on the Bulgasari, a Korean legend about an iron-eating monster, and on the nodosaurs, a family of armoured dinosaurs. These are fan readings.

Evolution notes

Aron evolves into Lairon at level 32.

In the games

Aron arrived in Ruby and Sapphire and appears on the EVO Mode banner of Pokémon Pinball: Ruby & Sapphire. It cannot be obtained in Scarlet and Violet.

In the anime

Aron debuted in 'A Hole Lotta Trouble', where Ash and his friends wandered into a cave swarming with them and needed Steven Stone, who owned one himself, to guide them through.

Fun facts

• Its model changed between Generations VI and VII, when the back of its head went from black to metallic grey; Bulbapedia says only Glameow shares that distinction.
• In the Pokémon Adventures manga, Sapphire's first Pokémon is an Aron nicknamed Rono, which evolves before her Gym battle with Brawly and again on Mirage Island.
• The credits of Giratina and the Sky Warrior show an Aron and its evolved forms munching on the wreckage of the Megarig.

Sources: Bulbapedia: Aron (Pokémon) · Serebii: Aron (Scarlet/Violet Pokédex)

Base stats

• HP: 50
• Attack: 70
• Defense: 100
• Sp. Atk: 40
• Sp. Def: 40
• Speed: 30

Aron’s base stat total is 330. Its highest stat is Defense.

Type matchups

What is Aron weak to?

Aron takes extra damage from Fighting (4×), Ground (4×), Water (2×) moves.

It resists Normal (¼×), Flying (¼×), Ice (½×), Psychic (½×), Bug (½×), Rock (½×), Dragon (½×), Fairy (½×).

It is immune to Poison moves.

Evolution

How does Aron evolve?

Aron evolves into Lairon at level 32.

The whole family: Aron, Lairon, Aggron.

• Lairon evolves into Aggron at level 42.

Abilities

• Sturdy: Prevents being KOed from full HP, leaving 1 HP instead. Protects against the one-hit KO moves regardless of HP.
• Rock Head: Protects against recoil damage.
• Heavy Metal (hidden ability): Doubles the Pokémon's weight.

Moves

Moves Aron learns by level up in Sword / Shield

TM moves (30)

Aron can learn 30 moves from TMs in Sword / Shield: Dig, Screech, Rest, Rock Slide, Snore, Protect, Attract, Sandstorm, Rain Dance, Sunny Day, Facade, Rock Tomb, Shadow Claw, Round, Bulldoze, Body Slam, Earthquake, Substitute, Reversal, Endure, Sleep Talk, Iron Tail, Uproar, Superpower, Iron Defense, Earth Power, Iron Head, Stealth Rock, Heavy Slam, Body Press.

Egg moves (6):Curse, Dragon Rush, Endeavor, Head Smash, Mud-Slap, Stomp.

Move tutor moves (2): Steel Beam, Steel Roller.

Breeding & training

• Gender: 50% male, 50% female.
• Egg groups: Monster.
• Egg cycles: 35 (steps to hatch, Scarlet/Violet: 4,480).
• Catch rate: 180 out of 255.
• Base friendship (Gen 8 onward): 35.
• Growth rate: Slow (1,250,000 experience points to reach level 100).
• Defeating it gives 1 Defense effort value.
• Base experience yield: 66.

Pokédex entries

When Aron evolves, its steel armor peels off. In ancient times, people would collect Aron's shed armor and make good use of it in their daily lives. (Shield)

It eats iron ore—and sometimes railroad tracks— to build up the steel armor that protects its body. (Sword)

Aron has a body of steel. With one all-out charge, this Pokémon can demolish even a heavy dump truck. The destroyed dump truck then becomes a handy meal for the Pokémon. (Sapphire, Alpha Sapphire)

This Pokémon has a body of steel. To make its body, Aron feeds on iron ore that it digs from mountains. Occasionally, it causes major trouble by eating bridges and rails. (Ruby, Omega Ruby)

When it evolves, it sheds the steel carapace that covered its whole body and develops a new one. (HeartGold, SoulSilver, Y)

It usually lives deep in mountains. However, hunger may drive it to eat railroad tracks and cars. (Diamond, Pearl, Platinum, Black, White, X)

Names around the world

Trivia

• Shortest Rock type in Gen 3: 0.4 m.
• Lowest base stat total among Rock types in Gen 3: 330.
• Slowest Steel type in Gen 3: 30 Speed, shared with 1 other.
• Taller than 11% of all Pokémon (0.4 m).
• Heavier than 71% of all Pokémon (60 kg).
• Base stat total 330, ranked #741 of 1,025.
• One of 7 Pokémon that are both Steel and Rock.
• One of 107 gray Pokémon.
• Number 53 of 135 Pokémon introduced in Generation 3 (Hoenn).
• Part of an evolution family of 3 Pokémon.
• Can learn 48 different moves in Sword / Shield.
• Catch rate 180: about 23.5% per Poké Ball at full health.
• Appears in 9 distinct Pokédex entries.

Sources and fact-checking

• Stats, types, abilities, moves, evolutions, forms and Pokédex entries: PokéAPI open game data.
• Lore: written by pokee.si in our own words, researched from Bulbapedia: Aron (Pokémon), Serebii: Aron (Scarlet/Violet Pokédex).
• Pronunciation (AIR-un): it follows how the English anime, games or official videos say it.

Last checked: 20 October 2026. Every sentence of the lore was checked against Bulbapedia, Serebii and the game data.

Explore

Steel-type Pokémon · Rock-type Pokémon · Steel/Rock weaknesses and matchups · Hoenn region guide · Sturdy ability · Rock Head ability · Heavy Metal ability · Compare Aron · Full Pokédex · Type chart · All moves

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Gen 3 Steel-type Pokémon · Gen 3 Rock-type Pokémon · Gen 3 Pokémon list · Gray Pokémon list · Monster egg group · Pokémon that start with A

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