Magneton is the result of three Magnemite being linked together by a strong magnetic force, although a single Magnemite can evolve by itself when no other Magnemite are in the vicinity. The three Magnemite that Magneton consists of can be linked several ways. Magneton is most commonly seen as one Magnemite on top, and two Magnemite linked via body on the bottom, forming a triangle. However, in some cases, commonly seen in 3D Pokémon games, the Magnemite will not be connected at all, remaining in a triangular formation at rest, and being able to freely move within each other's vicinity to form other patterns. The magnetic forces that holds the three Magnemite together is powerful enough to dry up all moisture and raise the temperature 3.6 °F (2 °C) within a 3,300 foot (1,000 m) radius. It can also be disruptive to electronic devices.
Even though Magneton is a mechanical creature, it still has the need to eat. As seen in the anime, food for Magneton consists of electrical currents. It is usually found in rough terrain, often near power plants. When sunspots flare up, Magneton tends to appear more often, presumably due to the changes in the sun's magnetic field. It has been shown in the manga that it possesses the ability to form its electricity into both platforms and barriers. Despite its modern, artificial appearance, carvings depicting Magneton have been discovered at the Ruins of Alph, and one was shown in a flashback to the great war of Kalos, indicating it has existed for at least 3000 years.
Clemont owns a Magneton, which he keeps at the Lumiose Gym so Clembot can use it for Gym Battles while Clemont is away. It first appeared in Clemont's Got a Secret!, where it was shown to be able to separate itself into three Magnemite in order to dodge attacks.
Magneton makes their debut aboard the S.S. Anne in Danger: High Voltorb as one of Lt. Surge's Pokémon ready to attack Red. However, later in Buzz Off, Electabuzz!, some of them tortured Red with Thunderbolt. Lt. Surge uses two on his shoulder pads in Go for the Golbat where they produced sonic booms that act as a defensive barrier. Lt. Surge has a squad of Magneton, capable of using electromagnetism to create a tetrahedral aura. This aura is able to ferry people as well as attack and trap anything within, as seen in Volumes 3, 7, 10, and 12.
A wild Magneton appeared in Electro Magneton where it and three Magnemite attacked Blue and Evan, Blue used his Machamp to defeat it.
Jasmine's two Magneton first appeared in Quilava Quandary, they were seen accompanying Jasmine through Ecruteak City. They, along with their Trainer, were caught in the earthquake the ravaged the entire area.
Magneton, along with its pre-evolution Magnemite, were pure Electric-type Pokémon in Generation I, but became dual-type Electric/Steel in Generation II. This makes them the first Pokémon to ever change type, and the only ones to do so until Generation V when Rotom's formes were given an additional type.
Although it is said that Magneton is made up of three Magnemite, there is contradictory evidence seen in various forms of media.
In the only anime episode to date showing a Magnemite evolution, Get Along, Little Pokémon, when Ethan's Magnemite #6 evolves into Magneton, it "creates" two Magnemite during evolution, instead of combining with two real Magnemite. Similarly, in the main series games, when Magnemite reaches level 30, it evolves without the aid of two additional Magnemite. This is unlike Mantyke which requires a Remoraid to evolve.
In Pokémon Snap, a Magneton is clearly shown to be created by three Magnemite. Also, when two Magnemite get stuck together halfway through evolution in the original Mystery Dungeon games, they mention how three Magnemite must come together to evolve.
After evolution, Magneton becomes exactly ten times heavier than Magnemite. Logically, it would be three times heavier if it were actually made of three Magnemite. Magnemite weighs 13.2 lbs. (6.0 kg) whereas Magneton weighs 132.3 lbs. (60.0 kg).
Magneton and its pre-evolution Magnemite are two of few Pokémon that had their cry changed slightly in Generation III. This was due to Generation III utilizing a better sound effects game engine and newer game system.
Magneton has been used by more rival characters than any other Pokémon, being used by three: Blue, Silver, and Wally.
Despite most depictions of Magneton showing they are able to float through the air, Magneton does not have the Ability Levitate, so it is still affected by Ground-type moves. However, starting in Generation IV, Magneton can learn Magnet Rise, which simulates Levitate for five turns.