Steelix • Generation VIII Pokédex • Marriland.com

Steelix's Type

STEEL

GROUND

Steelix's Pokédex #s

National #: 208

Galar #: 179

Armor #: --

Crown #: --

Sinnoh #: 35

Steelix's Base Stats

HP:: 75

Attack:: 85

Defense:: 200

Sp. Atk:: 55

Sp. Def:: 65

Speed:: 30

Total:: 510

Misc. Info

Height:: 30'2" (9.2m)

Weight:: 881.8 lbs. (400 kg)

Gender Ratio:

Egg Groups:: Mineral

EXP At Lv. 100:: 1,000,000

EV Yield:: 2 Defense

Base EXP:: 179

Catch Rate:: 25

Base Happiness:: 70

Steelix's Abilities

Here are what abilities Steelix can possibly have, along with their effects.

Rock Head: Prevents all recoil damage Steelix takes from moves that cause recoil damage.

Sturdy: If Steelix has full HP and would be knocked out by a single hit, it survives with 1 HP. Also protects against OHKO moves.

Sheer Force: Damaging moves that have a % chance of an extra effect occurring lose that effect, but do 30% more damage.

Weaknesses & Resistances

Below is a list of what Steelix's weakness and resistance is to various types.

2×: FIRE

WATER

FIGHTING

GROUND

½: NORMAL

FLYING

PSYCHIC

BUG

DRAGON

STEEL

FAIRY

¼: ROCK

immune: ELECTRIC

POISON

Steelix's Evolution Line

Below you'll find a list of all Pokémon Steelix evolves from or into, along with its evolution method.

Onix: starting form

Steelix: trade while holding Metal Coat

Steelix's Alternate Forms

Gender Differences

Male ♂

Female ♀

Steelix's Moves in Brilliant Diamond & Shining Pearl

SwSh Mode BDSP Mode

Enable move tooltips?

Below is a list of all of the moves that Steelix can learn, along with what level it learns the move, the TM or TR number, and what egg moves it can learn, if any. Hover over a move (desktop/laptop) or click the ? button next to the move (mobile/tablet) to find out more about the move.

Level Up Moves

Here are all of the moves Steelix learns via level up. Anything marked "Evo." means it learns it upon evolving. If the level is 1, it can be relearned at a Pokémon Center.

Lv.	Move	Type	Power	Acc.%	PP	Target
1	Crunch 20% chance of lowering the target's Defense by one stage.	DARK	80	100%	15	One Target
1	Thunder Fang Has a 10% chance to paralyze the target. Has a separate 10% chance to make the target flinch.	ELECTRIC	65	95%	15	One Target
1	Ice Fang Has a 10% chance to freeze the target. Has a separate 10% chance to make the target flinch.	ICE	65	95%	15	One Target
1	Fire Fang Has a 10% chance to burn the target. Has a separate 10% chance to make the target flinch.	FIRE	65	95%	15	One Target
1	Rock Polish Raises Steelix's Speed by two stages.	ROCK	--	--	20	User
1	Tackle Damages the target.	NORMAL	40	100%	35	One Target
1	Harden Raises Steelix's Defense by one stage.	NORMAL	--	--	30	User
1	Bind Traps the target for 4–5 turns, preventing them from switching or fleeing and also doing 1/8 max HP after every turn.	NORMAL	15	85%	20	One Target
1	Rock Throw Damages the target.	ROCK	50	90%	15	One Target
4	Smack Down The target can be hit by Ground-type moves after being hit by Smack Down.	ROCK	50	100%	15	One Target
8	Autotomize Raises Steelix's Speed by two stages and reduces its weight by half.	STEEL	--	--	15	User
12	Dragon Breath Has a 30% chance to paralyze the target.	DRAGON	60	100%	20	One Target
16	Curse Raises Steelix's Attack and Defense by one stage, but lowers its Speed by one stage.	GHOST	--	--	10	Counter
20	Rock Slide Has a 30% chance of causing all nearby enemies to flinch.	ROCK	75	90%	10	Nearby Enemies
24	Screech Lowers the target's Defense by two stages.	NORMAL	--	85%	40	One Target
28	Sand Tomb Traps the target for 4–5 turns, preventing them from switching or fleeing and also doing 1/8 max HP after every turn.	GROUND	35	85%	15	One Target
32	Stealth Rock Sets floating rocks on the enemy's field. Does 1/8 max HP to enemies that switch in. Weakness/resistance to Rock affects this damage.	ROCK	--	--	20	Enemy Field
36	Slam Damages the target.	NORMAL	80	75%	20	One Target
40	Sandstorm Changes the weather to a sandstorm for 5 turns.	ROCK	--	--	10	Entire Field
44	Dig Can't be hit on the first turn, attacks on the second turn.	GROUND	80	100%	10	One Target
48	Iron Tail 30% chance of lowering the target's Defense by one stage.	STEEL	100	75%	15	One Target
52	Stone Edge Has a higher critical hit rate. (+1 stage.)	ROCK	100	80%	5	One Target
56	Double-Edge Steelix takes 33% of Double-Edge's damage as recoil damage.	NORMAL	120	100%	15	One Target
60	Magnet Rise Steelix becomes immune to Ground-type moves and effects for the next 5 turns.	ELECTRIC	--	--	10	User

TM Moves

Here are all of the moves that Steelix can learn via TM (Technical Machine). These moves can be taught an unlimited number of times once the TM is obtained.

TM	Move	Type	Power	Acc.%	PP	Target
TM08	Hyper Beam Requires a turn to recharge (unless it misses).	NORMAL	150	90%	5	One Target
TM09	Giga Impact Requires a turn to recharge (unless it misses).	NORMAL	150	90%	5	One Target
TM15	Dig Can't be hit on the first turn, attacks on the second turn.	GROUND	80	100%	10	One Target
TM16	Screech Lowers the target's Defense by two stages.	NORMAL	--	85%	40	One Target
TM20	Self-Destruct Steelix is knocked out after using Self-Destruct.	NORMAL	200	100%	5	All But Self
TM21	Rest Steelix restores its HP to full and falls asleep for two turns.	PSYCHIC	--	--	10	User
TM22	Rock Slide Has a 30% chance of causing all nearby enemies to flinch.	ROCK	75	90%	10	Nearby Enemies
TM24	Snore Can only be used while asleep. 30% chance of making the target flinch.	NORMAL	50	100%	15	One Target
TM25	Protect Protects Steelix from attacks for a turn. Low chance of working on consecutive turns.	NORMAL	--	--	10	User
TM26	Scary Face Lowers the target's Speed by two stages.	NORMAL	--	100%	10	One Target
TM31	Attract Infatuates Pokémon of the opposite gender.	NORMAL	--	100%	15	One Target
TM32	Sandstorm Changes the weather to a sandstorm for 5 turns.	ROCK	--	--	10	Entire Field
TM34	Sunny Day Changes the weather to sunny for 5 turns.	FIRE	--	--	5	Entire Field
TM39	Facade Does double damage if Steelix is poisoned, burned, or paralyzed.	NORMAL	70	100%	20	One Target
TM48	Rock Tomb 100% chance of lowering the target's Speed by one stage.	ROCK	60	95%	15	One Target
TM49	Sand Tomb Traps the target for 4–5 turns, preventing them from switching or fleeing and also doing 1/8 max HP after every turn.	GROUND	35	85%	15	One Target
TM54	Rock Blast Hits the target two to five times in a row.	ROCK	25	90%	10	One Target
TM57	Payback Does double damage if Steelix attacks after the target.	DARK	50	100%	10	One Target
TM66	Thunder Fang Has a 10% chance to paralyze the target. Has a separate 10% chance to make the target flinch.	ELECTRIC	65	95%	15	One Target
TM67	Ice Fang Has a 10% chance to freeze the target. Has a separate 10% chance to make the target flinch.	ICE	65	95%	15	One Target
TM68	Fire Fang Has a 10% chance to burn the target. Has a separate 10% chance to make the target flinch.	FIRE	65	95%	15	One Target
TM76	Round Deals double damage if Round has already been used and causes any other Pokémon using Round to use it immediately afterward.	NORMAL	60	100%	15	One Target
TM81	Bulldoze 100% chance of lowering all nearby Pokémon's Speed by one stage.	GROUND	60	100%	20	All But Self
TM97	Brutal Swing Damages all nearby Pokémon.	DARK	60	100%	20	All But Self
TM98	Stomping Tantrum Power is doubled if Steelix missed the target last turn.	GROUND	75	100%	10	One Target
TM99	Breaking Swipe Lowers all nearby enemies' Attack by one stage.	DRAGON	60	100%	15	Nearby Enemies

TR Moves

Here are all of the moves that Steelix can learn via TR (Technical Record). These moves can be taught only once per TR, but TRs can be obtained in the Wild Area and other locations.

TR	Move	Type	Power	Acc.%	PP	Target
TR01	Body Slam Has a 30% chance to paralyze the target.	NORMAL	85	100%	15	One Target
TR10	Earthquake Does double damage against targets using Dig.	GROUND	100	100%	10	All But Self
TR20	Substitute Costs 25% of Steelix's max HP. Sets up a Substitute to block effects and damage.	NORMAL	--	--	10	User
TR26	Endure Will survive any hit with at least 1 HP left this turn. 50% chance of working on consecutive turns.	NORMAL	--	--	10	User
TR27	Sleep Talk Can only be used while asleep. Uses one of Steelix's moves at random.	NORMAL	--	--	10	User
TR31	Iron Tail 30% chance of lowering the target's Defense by one stage.	STEEL	100	75%	15	One Target
TR32	Crunch 20% chance of lowering the target's Defense by one stage.	DARK	80	100%	15	One Target
TR37	Taunt Prevents the target from using Status moves for the next few turns.	DARK	--	100%	20	One Target
TR46	Iron Defense Raises Steelix's Defense by two stages.	STEEL	--	--	15	User
TR51	Dragon Dance Raises Steelix's Attack and Speed by one stage.	DRAGON	--	--	20	User
TR52	Gyro Ball Does more damage based on how much lower Steelix's Speed is compared to the target's.	STEEL	varies	100%	5	One Target
TR58	Dark Pulse Has a 20% chance of causing the target to flinch.	DARK	80	100%	15	One Target
TR62	Dragon Pulse Damages the target.	DRAGON	85	100%	10	One Target
TR67	Earth Power 10% chance of lowering the target's Sp. Def by one stage.	GROUND	90	100%	10	One Target
TR70	Flash Cannon 10% chance of lowering the target's Sp. Def by one stage.	STEEL	80	100%	10	One Target
TR74	Iron Head Has a 30% chance of causing the target to flinch.	STEEL	80	100%	15	One Target
TR75	Stone Edge Has a higher critical hit rate. (+1 stage.)	ROCK	100	80%	5	One Target
TR76	Stealth Rock Sets floating rocks on the enemy's field. Does 1/8 max HP to enemies that switch in. Weakness/resistance to Rock affects this damage.	ROCK	--	--	20	Enemy Field
TR79	Heavy Slam Power ranges from 40–120 based on Steelix's weight vs. the target's weight.	STEEL	varies	100%	10	One Target
TR87	Drill Run Has a higher critical hit rate. (+1 stage.)	GROUND	80	95%	10	One Target
TR94	High Horsepower Damages the target.	GROUND	95	95%	10	One Target
TR97	Psychic Fangs Breaks the opponent's Light Screen or Reflect.	PSYCHIC	85	100%	10	One Target
TR99	Body Press Does more damage based on how high Steelix's Defense stat is.	FIGHTING	80	100%	10	One Target

Egg Moves

Here are all of the moves that Steelix can learn as Egg Moves. In the case of evolved Pokémon, it shows what Egg Moves it can learn in its lowest evolutionary stage. Click the word EGG to find compatible breeding Pokémon to get that Egg Move onto Steelix.

	Move	Type	Power	Acc.%	PP	Target
EGG	Flail Does more damage when Steelix's HP is low.	NORMAL	varies	100%	15	One Target
EGG	Block Prevents the target from fleeing or switching out.	NORMAL	--	--	5	One Target
EGG	Defense Curl Raises Steelix's Defense by one stage. Rollout and Ice Ball do double damage.	NORMAL	--	--	40	User
EGG	Wide Guard Protects your team from moves that hit multiple targets for the turn.	ROCK	--	--	10	User's Field
EGG	Rollout Lose control for up to 5 turns, with each hit doing 2× as much. Doubles damage if Defense Curl was used beforehand.	ROCK	30	90%	20	One Target
EGG	Dragon Tail -6 priority. After doing damage, forces the foe to switch out, or ends wild battles.	DRAGON	60	90%	10	One Target
EGG	Head Smash Steelix takes 50% of Head Smash's damage as recoil damage.	ROCK	150	80%	5	One Target

Move Tutor Moves

Here are all of the moves that Steelix can learn from Move Tutors. Most of these require the Expansion Pass and can be found in the Isle of Armor's Dojo, costing some Armorite Ore to teach. However, there are a few moves that can be taught aside from this.

	Move	Type	Power	Acc.%	PP	Target
TUTOR	Scorching Sands Has a 30% chance to burn the target.	GROUND	70	100%	10	One Target
TUTOR	Meteor Beam Raises Steelix's Sp. Atk by one stage. Charges for a turn, attacks on second turn.	ROCK	120	90%	10	One Target
TUTOR	Steel Roller Steel Roller fails if used while there is no Terrain in effect. After doing damage, any active Terrain effect is removed.	STEEL	130	100%	5	One Target

Level Up Moves

Here are all of the moves Steelix learns via level up. Anything marked "Evo." means it learns it upon evolving. If the level is 1, it can be relearned at a Pokémon Center.

Lv.	Move	Type	Power	Acc.%	PP	Target
1	Crunch 20% chance of lowering the target's Defense by one stage.	DARK	80	100%	15	One Target
1	Thunder Fang Has a 10% chance to paralyze the target. Has a separate 10% chance to make the target flinch.	ELECTRIC	65	95%	15	One Target
1	Ice Fang Has a 10% chance to freeze the target. Has a separate 10% chance to make the target flinch.	ICE	65	95%	15	One Target
1	Fire Fang Has a 10% chance to burn the target. Has a separate 10% chance to make the target flinch.	FIRE	65	95%	15	One Target
1	Rock Polish Raises Steelix's Speed by two stages.	ROCK	--	--	20	User
1	Tackle Damages the target.	NORMAL	40	100%	35	One Target
1	Harden Raises Steelix's Defense by one stage.	NORMAL	--	--	30	User
1	Bind Traps the target for 4–5 turns, preventing them from switching or fleeing and also doing 1/8 max HP after every turn.	NORMAL	15	85%	20	One Target
1	Rock Throw Damages the target.	ROCK	50	90%	15	One Target
4	Smack Down The target can be hit by Ground-type moves after being hit by Smack Down.	ROCK	50	100%	15	One Target
8	Autotomize Raises Steelix's Speed by two stages and reduces its weight by half.	STEEL	--	--	15	User
12	Dragon Breath Has a 30% chance to paralyze the target.	DRAGON	60	100%	20	One Target
16	Curse Raises Steelix's Attack and Defense by one stage, but lowers its Speed by one stage.	GHOST	--	--	10	Counter
20	Rock Slide Has a 30% chance of causing all nearby enemies to flinch.	ROCK	75	90%	10	Nearby Enemies
24	Screech Lowers the target's Defense by two stages.	NORMAL	--	85%	40	One Target
28	Sand Tomb Traps the target for 4–5 turns, preventing them from switching or fleeing and also doing 1/8 max HP after every turn.	GROUND	35	85%	15	One Target
32	Stealth Rock Sets floating rocks on the enemy's field. Does 1/8 max HP to enemies that switch in. Weakness/resistance to Rock affects this damage.	ROCK	--	--	20	Enemy Field
36	Slam Damages the target.	NORMAL	80	75%	20	One Target
40	Sandstorm Changes the weather to a sandstorm for 5 turns.	ROCK	--	--	10	Entire Field
44	Dig Can't be hit on the first turn, attacks on the second turn.	GROUND	80	100%	10	One Target
48	Iron Tail 30% chance of lowering the target's Defense by one stage.	STEEL	100	75%	15	One Target
52	Stone Edge Has a higher critical hit rate. (+1 stage.)	ROCK	100	80%	5	One Target
56	Double-Edge Steelix takes 33% of Double-Edge's damage as recoil damage.	NORMAL	120	100%	15	One Target
60	Magnet Rise Steelix becomes immune to Ground-type moves and effects for the next 5 turns.	ELECTRIC	--	--	10	User

TM Moves

Here are all of the moves that Steelix can learn via TM (Technical Machine). These moves can be taught once per use of the TM.

TM	Move	Type	Power	Acc.%	PP	Target
TM05	Roar Forces the foe to switch out, or ends wild battles.	NORMAL	--	--	20	One Target
TM11	Sunny Day Changes the weather to sunny for 5 turns.	FIRE	--	--	5	Entire Field
TM12	Taunt Prevents the target from using Status moves for the next few turns.	DARK	--	100%	20	One Target
TM15	Hyper Beam Requires a turn to recharge (unless it misses).	NORMAL	150	90%	5	One Target
TM17	Protect Protects Steelix from attacks for a turn. Low chance of working on consecutive turns.	NORMAL	--	--	10	User
TM23	Iron Tail 30% chance of lowering the target's Defense by one stage.	STEEL	100	75%	15	One Target
TM26	Earthquake Does double damage against targets using Dig.	GROUND	100	100%	10	All But Self
TM28	Dig Can't be hit on the first turn, attacks on the second turn.	GROUND	80	100%	10	One Target
TM32	Double Team Raises Steelix's Evasion by one stage.	NORMAL	--	--	15	User
TM37	Sandstorm Changes the weather to a sandstorm for 5 turns.	ROCK	--	--	10	Entire Field
TM39	Rock Tomb 100% chance of lowering the target's Speed by one stage.	ROCK	60	95%	15	One Target
TM41	Torment Prevents the target from using the same move twice in a row.	DARK	--	100%	15	One Target
TM42	Facade Does double damage if Steelix is poisoned, burned, or paralyzed.	NORMAL	70	100%	20	One Target
TM44	Rest Steelix restores its HP to full and falls asleep for two turns.	PSYCHIC	--	--	10	User
TM45	Attract Infatuates Pokémon of the opposite gender.	NORMAL	--	100%	15	One Target
TM58	Endure Will survive any hit with at least 1 HP left this turn. 50% chance of working on consecutive turns.	NORMAL	--	--	10	User
TM59	Dragon Pulse Damages the target.	DRAGON	85	100%	10	One Target
TM64	Explosion Steelix is knocked out after using Explosion.	NORMAL	250	100%	5	All But Self
TM66	Payback Does double damage if Steelix attacks after the target.	DARK	50	100%	10	One Target
TM68	Giga Impact Requires a turn to recharge (unless it misses).	NORMAL	150	90%	5	One Target
TM69	Rock Polish Raises Steelix's Speed by two stages.	ROCK	--	--	20	User
TM71	Stone Edge Has a higher critical hit rate. (+1 stage.)	ROCK	100	80%	5	One Target
TM74	Gyro Ball Does more damage based on how much lower Steelix's Speed is compared to the target's.	STEEL	varies	100%	5	One Target
TM76	Stealth Rock Sets floating rocks on the enemy's field. Does 1/8 max HP to enemies that switch in. Weakness/resistance to Rock affects this damage.	ROCK	--	--	20	Enemy Field
TM77	Psych Up Copies all stat modifiers on the target.	NORMAL	--	--	10	One Target
TM79	Dark Pulse Has a 20% chance of causing the target to flinch.	DARK	80	100%	15	One Target
TM80	Rock Slide Has a 30% chance of causing all nearby enemies to flinch.	ROCK	75	90%	10	Nearby Enemies
TM82	Sleep Talk Can only be used while asleep. Uses one of Steelix's moves at random.	NORMAL	--	--	10	User
TM83	Bulldoze 100% chance of lowering all nearby Pokémon's Speed by one stage.	GROUND	60	100%	20	All But Self
TM87	Swagger Raises the target's Attack by two stages and confuses it.	NORMAL	--	85%	15	One Target
TM90	Substitute Costs 25% of Steelix's max HP. Sets up a Substitute to block effects and damage.	NORMAL	--	--	10	User
TM91	Flash Cannon 10% chance of lowering the target's Sp. Def by one stage.	STEEL	80	100%	10	One Target
TM93	Cut Damages the target.	NORMAL	50	95%	30	One Target
TM96	Strength Damages the target.	NORMAL	80	100%	15	One Target
TM98	Rock Smash 50% chance of lowering the target's Defense by one stage.	FIGHTING	40	100%	15	One Target
TM100	Rock Climb Has a 20% chance of confusing the target.	NORMAL	90	85%	20	One Target

Egg Moves

Here are all of the moves that Steelix can learn as Egg Moves. In the case of evolved Pokémon, it shows what Egg Moves it can learn in its lowest evolutionary stage. Click the word EGG to find compatible breeding Pokémon to get that Egg Move onto Steelix.

	Move	Type	Power	Acc.%	PP	Target
EGG	Flail Does more damage when Steelix's HP is low.	NORMAL	varies	100%	15	One Target
EGG	Block Prevents the target from fleeing or switching out.	NORMAL	--	--	5	One Target
EGG	Defense Curl Raises Steelix's Defense by one stage. Rollout and Ice Ball do double damage.	NORMAL	--	--	40	User
EGG	Wide Guard Protects your team from moves that hit multiple targets for the turn.	ROCK	--	--	10	User's Field
EGG	Rollout Lose control for up to 5 turns, with each hit doing 2× as much. Doubles damage if Defense Curl was used beforehand.	ROCK	30	90%	20	One Target
EGG	Dragon Tail -6 priority. After doing damage, forces the foe to switch out, or ends wild battles.	DRAGON	60	90%	10	One Target
EGG	Head Smash Steelix takes 50% of Head Smash's damage as recoil damage.	ROCK	150	80%	5	One Target
EGG	Rock Blast Hits the target two to five times in a row.	ROCK	25	90%	10	One Target
EGG	Heavy Slam Power ranges from 40–120 based on Steelix's weight vs. the target's weight.	STEEL	varies	100%	10	One Target

Steelix's Detailed Stats

Below you'll find a more detailed table containing Steelix's calculated stats, which are the stats that you actually see displayed in game. These are affected by a variety of things, such as level, Effort Values (EVs), Individual Values (IVs), and Steelix's Nature.

By default, the stats you see in the table below show four different possibilities, all assuming Steelix is level 100: its stats with 0 EVs, 252+ (max) EVs, 0 IVs, and 31 (max) IVs. Nature is not shown by default, so its maximum is 10% higher than shown here, and minium 10% lower.

Stats at level 100	0 EVs		252+ EVs		Base Stat
Stats at level 100	Min	Max	Min	Max	Base Stat
HP	260	291	323	354	75
Attack	175	206	238	269	85
Defense	405	436	468	499	200
Sp. Atk	115	146	178	209	55
Sp. Def	135	166	198	229	65
Speed	65	96	128	159	30
Total					510

Where to Find Steelix in Brilliant Diamond & Shining Pearl

SwSh Mode BDSP Mode

If you're looking for where to find Steelix, you'll find the various methods listed down below, along with any notes or special locations. This should help you figure out how to get Steelix in Pokémon Sword & Shield. (Currently this does not show most "strong" static encounters or Max Raid Battles.)

Special Ways to Get Steelix

Available in some Max Raid Dens in the Wild Area.

Getting Steelix By Evolution

Evolves from Onix when traded while holding a

Metal Coat.

Location information on where to find Steelix in Pokémon Brilliant Diamond & Shining Pearl will be coming to the Marriland Pokédex in a future update! Thank you for your patience!

Pokédex Entries for Steelix

Generation 8 Pokédex Entries

Sword

It is said that if an Onix lives for over 100 years, its composition changes to become diamond-like.

Shield

It is thought its body transformed as a result of iron accumulating internally from swallowing soil.

Generation 6 Pokédex Entries

X

Tempered underground under high pressure and heat, its body is harder than any metal.

Y

It chews its way through boulders with its sturdy jaws. Its eyes can see in the darkness underground.

Omega Ruby Alpha Sapphire

Steelix lives even further underground than Onix. This Pokémon is known to dig toward the earth's core. There are records of this Pokémon reaching a depth of over six-tenths of a mile underground.

Generation 5 Pokédex Entries

Black White

It is thought its body transformed as a result of iron accumulating internally from swallowing soil.

Black 2 White 2

The iron it ingested with the soil it swallowed transformed its body and made it harder than diamonds.

Generation 4 Pokédex Entries

Diamond

Tempered underground under high pressure and heat, its body is harder than any metal.

Pearl

It chews its way through boulders with its sturdy jaws. Its eyes can see in the darkness underground.

Platinum

It is thought its body transformed as a result of iron accumulating internally from swallowing soil.

HeartGold

Its body has been compressed deep under the ground. As a result, it is even harder than a diamond.

SoulSilver

It's said that if an ONIX lives for 100 years, its composition becomes diamondlike as it evolves into a STEELIX.

Generation 3 Pokédex Entries

Ruby Sapphire

STEELIX lives even further underground than ONIX. This POKéMON is known to dig towards the earth's core. There are records of this POKéMON reaching a depth of over six-tenths of a mile underground.

Emerald

STEELIX live even further underground than ONIX. This POKéMON is known to dig toward the earth's core, reaching a depth of over six-tenths of a mile underground.

FireRed

It is said that if an ONIX lives for over 100 years, its composition changes to become diamond-like.

LeafGreen

Its body has been compressed deep under the ground. As a result, it is even harder than diamond.

Generation 2 Pokédex Entries

Gold

Its body has been compressed deep under the ground. As a result, it is even harder than a diamond.

Silver

It is said that if an ONIX lives for over 100 years, its composition changes to become diamond-like.

Crystal

The many small metal particles that cover this POKéMON's body reflect bright light well.