Aggron is a huge, bipedal Pokémon. It is primarily black with plates of silver-colored armor. The armor on its head has two pairs of holes with horns protruding from the foremost holes. Its forehead plating extends past its upper jaw in a small point. It has sky-blue eyes, and two nostril-like holes on the tip of its upper jaw. On the rim of its mouth are several pointed, fang-like protrusions and the nape of its neck and back have gray-silver armor sections. It has wide, blunt spikes on its shoulders, and gray-silver bands on its arms and legs. Its hands and feet each have three claws. It has a thick, long, black tail that it can swing at enemies.
Mega Aggron is bulkier and more heavily plated than its previous state. The horns on its forehead are now shorter, and it has a third, wider horn on its nose. Using its horns, it is said to be able to destroy a steel tank.[1] A spike projects downward from both its upper and lower jaw. The protrusions on its shoulders are longer and curve toward its head, and new spikes thrust from holes in its armbands. Its tail is thicker with two bands around it.
The gouges in Aggron's armor from previous battles are worn as mementos. The more wounds it has, the more it has battled. It claims a large mountain as its territory and fiercely defends it from trespassers. If its environment is damaged by a flood or a forest fire, it will restore the area by bringing in topsoil and planting trees. It burrows through the strongest of bedrock and digs tunnels, as it searches for iron to eat. Its horns, which it uses to dig through bedrock when seeking food, grow a little longer at a time and can be used to determine its age.
In the main series
Major appearances
Aggron debuted in A Hole Lotta Trouble, under the ownership of Steven Stone. The Iron Armor Pokémon was used to send Team Rocket flying before being recalled into its Poké Ball.
An Aggron appeared in Pikachu's Summer Festival, where it sent a Skarmory to kidnap an Azumarill to sing for him and his children.
An Aggron appeared in Shocks and Bonds, under the ownership of Johnny. It was used in a Double Battle against Tyson's Sceptile, and was defeated by its Solar Beam.
Jessie and James were temporarily given a Charizard and Aggron in Grating Spaces. The two Pokémon were used to battle Ash's Donphan and Brock's Steelix. Along with Charizard, Aggron was returned to Delibird, who meant to give them to Butch and Cassidy.
An Aggron appeared in Bibarel Gnaws Best!, under the ownership of the head engineer. It was used to attack a Bibarel alongside a Metang and Magmar, but Bibarel dodged its attack. It was eventually defeated by Ash's Buizel's super-effective Water Gun.
In Pokémon Ranger and the Kidnapped Riolu! (Part 2), J's client used an Aggron to block up passages in a cave in order to prevent Ash and Kellyn from following him.
An Aggron appeared in Steeling Peace of Mind! and Saving the World From Ruins!, where it was one of the Steel-type Pokémon on Iron Island that had gone crazy due to Team Galactic's actions.
An Aggron appeared in Trials and Adulations!, where it fought against Dawn's Mamoswine.
An Aggron appeared in Familiarity Breeds Strategy!, under the ownership of Paul. It was used in his Lily of the Valley Conference battle against Ash, fighting well against Pikachu with its powerful moves. However, it could not stand on the same par as Ash's Infernape and was defeated with a Mach Punch.
An Aggron that can Mega Evolve appeared in Volcanion and the Mechanical Marvel, under the control of Levi and Cherie's Mega Wave. Aggron was used to battle against Ash's Pikachu, Squishy, and Volcanion. It was later freed from their control when Alva's Mega Wave Crystal was destroyed, and it escaped.
An Aggron that can Mega Evolve appeared in The Prism Between Light and Darkness!, under the ownership of Gozu. Gozu sent it out to battle Professor Kukui and Faba, where it attacked Hypno, Braviary, and Alakazam. It reappeared in Securing the Future!, where it was defeated by Kukui's Incineroar.
Minor appearances
An Aggron appeared in Having a Wailord of a Time, under the ownership of a contestant.
An Aggron made a cameo appearance in the opening sequence of Jirachi: Wish Maker, under the ownership of Brendan. He used it alongside a Shiftry in a Double Battle.
An Aggron appeared in PK13.
A Trainer's Aggron appeared in a fantasy in Like a Meowth to a Flame.
Multiple Aggron appeared in Lucario and the Mystery of Mew as part of the feuding armies. Also, an Aggron owned by a Trainer won against another Trainer's Hitmonlee during the Rota tournament.
Dr. Yung used a Mirage Aggron in The Mastermind of Mirage Pokémon.
An Aggron made a cameo appearance in Glory Blaze!. Under the ownership of Conway, it battled alongside Dawn's Pachirisu in the Hearthome City Tag Battle Competition.
An Aggron appeared in Giratina and the Sky Warrior alongside Aron and Lairon. It helped Ash and his friends to stop a broken glacier.
An Aggron appeared in One Team, Two Team, Red Team, Blue Team!
An Aggron appeared in the opening sequence of Zoroark: Master of Illusions.
A Trainer's Aggron appeared in The Journalist from Another Region!, where it was entered into the Pokémon Sumo Tournament on Harvest Island.
An Aggron that can Mega Evolve into Mega Aggron appeared in the opening of Mega Evolution Special I.
A Trainer's Aggron that can Mega Evolve appeared in Mega Evolution Special IV as one of the ten Mega Evolved Pokémon that Alain and his Charizard had to defeat.
A soldier's Aggron appeared during a flashback in The Legend of X, Y, and Z!.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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AG022
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Aggron
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Ash's Pokédex
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Aggron, the Iron Armor Pokémon. Aggron is the final evolution of Aron. It shows no mercy to anyone who disturbs its habitat.
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Episode
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Pokémon
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Source
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Entry
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DP119
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Aggron
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Dawn's Pokédex
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Aggron, the Iron Armor Pokémon. Aggron's steel horns can destroy the firmest of bedrock and it digs tunnels as it looks for iron to eat.
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DP186
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Aggron
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Dawn's Pokédex
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Aggron, the Iron Armor Pokémon, and the evolved form of Lairon. Aggron claims a large mountain for its territory, and fiercely defends it from those who trespass.
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In Pokémon Generations
A soldier's Aggron appeared in The Redemption, during a fantasy of a story from the past. It was one of the many Pokémon fighting in the great war of Kalos 3,000 years previously.