Steelix can use one of two abilities: Rock Head, which prevents this Pokémon from receiving recoil damage from recoil-causing moves; or Sturdy, which gives this Pokémon an immunity from falling to a One-Hit KO move such as Fissure or Horn Drill, and starting with Generation V, Pokémon with Sturdy cannot be KO'd in one hit when it has full HP. Steelix's Hidden Ability is Sheer Force, which gives moves that have a secondary effect a 33% increase in power, but those moves also lose their secondary effect.
Steelix wasn't available in Generation I, but from Generation II onwards Onix could evolve into Steelix if it was traded to another game while holding a Metal Coat. When evolved Steelix loses the Rock type it has a Onix and instead it's main type becomes Steel. Starting in Omega Ruby and Alpha Sapphire, Steelix can Mega Evolve into Mega Steelix by using the Mega Stone if it is holding a Steelixite.
Steelix is in the Mineral Egg Group, and its Egg will take approximately 6,400 Steps to hatch. It takes Steelix One Million Experience Points to reach Level 100.
Steelix takes the appearance of a ginormous metallic snake.
Male Steelix will have an extra front overbite tooth on its lower jaw, whereas the Female Steelix will only have the one overbiting tooth.
Steelix was introduced in Generation II, and the only way to obtain one in Generation 2 and Generation III was to evolve Onix. Generation IV would change that, as for the first time Steelix could be obtained in the wild. In Diamond and Pearl Steelix could be obtained at Iron Mountain, Snowpoint Temple, and Victory Road; and at Iron Island and Victory Road in Platinum.
While Onix can be found at the lowest parts of Relic Castle in the Generation V games Black and White, at B6 and the Maze, the only way to obtain a Steelix would be to evolve Onix in Black and White. In Black 2 and White 2, Steelix can be found at Clay Tunnel and Twist Mountain.
Steelix makes appearances at Endless Level 12, Pair Trozei, Forever Level 61 and Mr. Who's den in Pokémon Trozei!.
The only way to obtain an Onix in the first set of Mystery Dungeon games is to evolve an Onix. In Explorers of Time, Explorers of Darkness and Explorers of Sky, Steelix can be found at and Sky Stairway 1F-49F at random. Steelix is exclusive to Stormy Adventure Squad in Mystery Dungeon 3, appearing on the Path to Treasure Mountain B23 & B24.
Steelix can only appear in Pokémon Ranger during missions, which is also the only time Steelix has appeared in the Pokémon Ranger series as of writing.
Steelix can be found at Terrera and Valora in Pokémon Conquest.
Trading Card Game
Steelix has appeared in 13 different sets, two of which twice, to total 15 different cards. The Steelix from the Rising Rivals and Plasma Freeze set are Uncommon cards. The Neo Genesis, VS (2), Aquapolis, Skyridge, EX Sandstorm, EX Team Rocket Returns, EX Unseen Forces, Diamond and Pearl, Stormfront, and Unleashed (2; 1 Ultra Rare) are Rare Cards, while the Shining Steelix from the Neo Destiny Set is one of the Hidden Cards from that set and is a three-star rare card.
Johto Gym Leader Jasmine was the first to utilize a Steelix in battle, which was the debut of Steelix in the episode Nerves of Steelix. Jasmine would also use her Steelix in an appearance in the episode Four Roads Diverged in a Pokémon Port.
Brock would return to Pewter Gym to have found that his Onix evolved into a Steelix while he was away in the episode Grating Spaces. Harrison, Morrison, and Gym Leader Byron have also used a Steelix in their battles.
Jasmine would also use a Steelix in the Manga, pitting it against Brock's Onix at the Gymleaders' Exhibition Battle in Chapter 155.
Carr, a member of Team Rocket's Beast Warrior Trio, uses a Steelix of his own in Chapters 278, 279 and 286.
Wild Steelix are also featured on Iron Island in Chapters 379-382 and 415.
Steelix is in the Neverused (NU) tier of competitive battling. With a great typing, massive Defense stat, and decent offensive prowess, Steelix is among the tier's best Stealth Rock setters. It can check numerous Pokémon in the tier, including Mega Audino, Musharna, Scyther, Archeops, and Kangaskhan. Good STAB attacks in Heavy Slam and Earthquake give Steelix enough of an offensive presence to not become easy set up bait against a number of threats. However, Steelix suffers in regards to its special bulk, especially when uninvested, and cannot handle certain special attacking threats like Choice Specs Swellow and offensive Mega Audino without taking a significant chunk of damage. It has some common weaknesses to Fire, Fighting, Ground, and Water, and some Pokémon use special coverage moves to take advantage of those weaknesses, like Fire Blast from the likes of Mega Audino and Tauros. It is also incredibly slow, being outsped by a large portion of the tier.
Steelix is also viable in the Rarelyused (RU) tier of competitive battling. With a unique typing that allows for it to check certain Pokémon that other defensive Ground-types would normally have trouble with, such as Meloetta and Magneton, Steelix is a steady defensive presence that gives nice utility. It has a great set of resistances and an immunity to Toxic, which puts it ahead of Pokémon like Rhyperior that can be worn down more easily than Steelix. Thanks to an incredible Defense stat, Steelix can focus its attention on its weaker Special Defense stat. It is also more immediately threatening than other defensive Steel-types like Bronzong and Registeel. However, compared to other Ground-types, it is more passive in nature and struggles against opposing Ground-types that can hit it super effectively. It also lacks a way to threaten Grass-types and has an Ice neutrality that does not do it favors against Mega Glalie and Abomasnow, both of which can be dealt with by other Steel-types.
Via Move Tutor (Omega Ruby/Alpha Sapphire)
Onix Exclusive Moves
Generation III Move Tutor Moves
Via Move Tutor
Heart Gold/Soul Silver
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