Pokedex · v4.0.3 / English v1.0.0-rc8

Onix

Onix in Pokemon Origin HeartGold: Rock/Ground typing, base stats, Abilities, evolution requirements, learnsets and where to find it.

Content reviewed 11 October 2026

RockGround

wild: Mt. Moon / Mt. Moon, east building, Rock Tunnel, Rock Tunnel B1F, Victory Road and 10 more; Trade Beedrill for Onix, Pewter Pokémon Center — Trade a Beedrill in the Pewter Pokémon Center. One trade per game.

Base stats Total 460

HP75

Attack75

Defense130

Sp. Atk30

Sp. Def75

Speed75

Abilities

Normal Ability slots

Slot 1: Weak Armor
Slot 2: Sturdy

Hidden Ability

Hustle

Capture-chain requirements

Where to find Onix

Location	Method / time	Level	Chance / weight
Mt. Moon / Mt. Moon, east building	Grass/cave, morning and day	12	5%
Mt. Moon / Mt. Moon, east building	Grass/cave, night	12	5%
Rock Tunnel	Grass/cave, morning	20–23	11%
Rock Tunnel	Grass/cave, day	20	10%
Rock Tunnel	Grass/cave, night	20	10%
Rock Tunnel B1F	Grass/cave, any time	16	20%
Victory Road	Grass/cave, any time	44	1%
Mt. Silver Cave Lower Mountainside	Grass/cave, any time	48	10%
Mt. Silver Cave	Grass/cave, morning and day	42	30%
Mt. Silver Cave	Grass/cave, night	42	30%
Union Cave	Grass/cave, morning and day	6	4%
Union Cave	Grass/cave, night	6	4%
Union Cave B1F	Grass/cave, morning and night	8	5%
Union Cave B1F	Grass/cave, day	8	5%
Whirl Islands	Grass/cave, morning and day	24	10%
Whirl Islands	Grass/cave, night	24	10%
Whirl Islands B2F	Grass/cave, any time	24	10%
Mt. Mortar	Grass/cave, morning	14–16	5%
Mt. Mortar	Grass/cave, day	14–16	5%
Mt. Mortar	Grass/cave, night	14–16	5%
Mt. Mortar 1F, back cave	Grass/cave, morning	14	4%
Mt. Mortar 1F, back cave	Grass/cave, day	14	4%
Mt. Mortar 1F, back cave	Grass/cave, night	14	4%
Mt. Mortar 2F	Grass/cave, day	14	4%
Mt. Mortar 2F	Grass/cave, night	14	4%
Mt. Mortar B1F	Grass/cave, morning and day	14	4%
Mt. Mortar B1F	Grass/cave, night	14	4%
Safari Zone: Wasteland	Safari Zone: Wasteland area selected, Grass, all day	15	Unknown
Safari Zone: Wasteland	Safari Zone: Wasteland area selected, Grass, all day	16	Unknown
Safari Zone: Wasteland	Safari Zone: Wasteland area selected, Grass, day and night	17	Unknown

Source	Location	Level	Requirements
trade	Pewter Pokémon Center	Not recorded	Trade a Beedrill in the Pewter Pokémon Center. One trade per game. Offer: Beedrill.

Encounter notes

Safari Zone: choose the listed area. Area selection unlocks during Baoba’s Sandshrew test, after his Geodude test. Object Arrangement never unlocks in this hack, so block-dependent bonus encounters are excluded. The listed candidates do not have a verified encounter percentage.

Evolution & forms

Evolves from

None recorded.

Evolves into

Steelix · Lv 45
at Lv 45

Related forms

Crystal Onix

Related records may have different availability. They are not automatically obtainable.

Moves Onix can learn

Level-up (18)

Method	Move	Type	Category	Power	Accuracy	PP
Lv. 1	Tackle	Normal	Physical	40	100	35
Lv. 1	Harden	Normal	Status	—	—	30
Lv. 1	Bind	Normal	Physical	15	85	20
Lv. 1	Rock Throw	Rock	Physical	50	90	15
Lv. 4	Smack Down	Rock	Physical	50	100	15
Lv. 8	Rock Polish	Rock	Status	—	—	20
Lv. 12	Dragon Breath	Dragon	Special	75	100	20
Lv. 16	Curse	Ghost	Status	—	—	10
Lv. 20	Rock Slide	Rock	Physical	75	90	10
Lv. 24	Screech	Normal	Status	—	85	40
Lv. 28	Sand Tomb	Ground	Physical	35	85	15
Lv. 32	Stealth Rock	Rock	Status	—	—	20
Lv. 36	Slam	Grass	Physical	70	100	20
Lv. 40	Sandstorm	Rock	Status	—	—	10
Lv. 44	Dig	Ground	Physical	80	100	10
Lv. 48	Iron Tail	Steel	Physical	90	90	15
Lv. 52	Stone Edge	Rock	Physical	100	80	5
Lv. 56	Double-Edge	Normal	Physical	120	100	15

TMs & HMs (40)

Method	Move	Type	Category	Power	Accuracy	PP
TM05	Roar	Normal	Status	—	—	20
TM10	Hidden Power	Normal	Special	60	100	15
TM11	Sunny Day	Fire	Status	—	—	5
TM12	Taunt	Dark	Status	—	100	20
TM17	Protect	Normal	Status	—	—	10
TM23	Iron Tail	Steel	Physical	90	90	15
TM26	Earthquake	Ground	Physical	100	100	10
TM27	Return	Normal	Physical	var.	100	20
TM28	Dig	Ground	Physical	80	100	10
TM32	Double Team	Normal	Status	—	—	15
TM37	Sandstorm	Rock	Status	—	—	10
TM39	Rock Tomb	Rock	Physical	60	95	15
TM41	Torment	Dark	Status	—	100	15
TM42	Facade	Normal	Physical	70	100	20
TM44	Rest	Psychic	Status	—	—	5
TM45	Attract	Normal	Status	—	100	15
TM58	Endure	Normal	Status	—	—	10
TM59	Dragon Pulse	Dragon	Special	85	100	10
TM64	Explosion	Normal	Physical	250	100	5
TM66	Payback	Dark	Physical	50	100	10
TM69	Rock Polish	Rock	Status	—	—	20
TM71	Stone Edge	Rock	Physical	100	80	5
TM74	Gyro Ball	Steel	Physical	var.	100	5
TM76	Stealth Rock	Rock	Status	—	—	20
TM77	Psych Up	Normal	Status	—	—	10
TM80	Rock Slide	Rock	Physical	75	90	10
TM82	Sleep Talk	Normal	Status	—	—	10
TM87	Swagger	Normal	Status	—	85	15
TM90	Substitute	Normal	Status	—	—	10
TM91	Flash Cannon	Steel	Special	80	100	10
TM95	Heavy Slam	Steel	Physical	var.	100	10
TM103	Bulldoze	Ground	Physical	60	100	20
TM115	High Horsepower	Ground	Physical	95	95	10
TM119	Brutal Swing	Dark	Physical	60	100	20
TM123	Body Press	Fighting	Physical	80	100	10
TM125	Meteor Beam	Rock	Special	120	90	10
TM130	Scorching Sands	Ground	Special	70	100	10
HM04	Strength	Normal	Physical	80	100	15
HM06	Rock Smash	Fighting	Physical	60	100	15
HM08	Rock Climb	Normal	Physical	90	85	20

Move tutors (5)

Method	Move	Type	Category	Power	Accuracy	PP
Tutor	Body Slam	Normal	Physical	85	100	15
Tutor	Curse	Ghost	Status	—	—	10
Tutor	Dragon Dance	Dragon	Status	—	—	20
Tutor	Earth Power	Ground	Special	90	100	10
Tutor	Iron Head	Steel	Physical	80	100	15

Egg moves (9)

Method	Move	Type	Category	Power	Accuracy	PP
Breeding	Block	Normal	Status	—	—	5
Breeding	Defense Curl	Normal	Status	—	—	40
Breeding	Dragon Tail	Dragon	Physical	60	90	10
Breeding	Flail	Normal	Physical	var.	100	15
Breeding	Head Smash	Rock	Physical	120	95	10
Breeding	Heavy Slam	Steel	Physical	var.	100	10
Breeding	Rock Blast	Rock	Physical	25	90	10
Breeding	Rollout	Rock	Physical	30	90	20
Breeding	Wide Guard	Rock	Status	—	—	10

Training & breeding

Catch rate value: 45 (not a catch percentage)
Gender ratio: 50.0% female
Egg groups: Mineral
Growth rate: Medium Fast
EV yield: 1 Defense
Possible held items: None recorded