Pokedex · v4.0.3 / English v1.0.0-rc8

Koffing

Koffing in Pokemon Origin HeartGold: Poison typing, base stats, Abilities, evolution requirements, learnsets and where to find it.

Content reviewed 11 October 2026

Poison

wild: Route 17, Route 13, Burned Tower

Base stats Total 340

HP40

Attack65

Defense95

Sp. Atk60

Sp. Def45

Speed35

Abilities

Normal Ability slots

Slot 1: Levitate
Slot 2: Neutralizing Gas

Hidden Ability

Stench

Capture-chain requirements

Where to find Koffing

wild: Route 17, Route 13, Burned Tower

Location	Method / time	Level	Chance / weight
Route 17	Grass/cave, morning	27	10%
Route 17	Grass/cave, day	27	10%
Route 17	Grass/cave, night	27	10%
Route 13	Grass/cave, morning	25	10%
Route 13	Grass/cave, day	25	10%
Route 13	Grass/cave, night	25	10%
Burned Tower	Grass/cave, any time	14	30%
Safari Zone: Marshland	Safari Zone: Marshland area selected, Grass, all day	15	Unknown
Safari Zone: Marshland	Safari Zone: Marshland area selected, Grass, all day	16	Unknown
Safari Zone: Marshland	Safari Zone: Marshland area selected, Grass, all day	17	Unknown

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

Weezing · Lv 25
at Lv 25

Moves Koffing can learn

Level-up (15)

Method	Move	Type	Category	Power	Accuracy	PP
Lv. 1	Poison Gas	Poison	Status	—	90	40
Lv. 1	Tackle	Normal	Physical	40	100	35
Lv. 4	Smog	Poison	Special	30	70	20
Lv. 8	Smokescreen	Normal	Status	—	100	20
Lv. 12	Clear Smog	Poison	Special	50	—	15
Lv. 16	Assurance	Dark	Physical	60	100	10
Lv. 20	Sludge	Poison	Special	65	100	20
Lv. 24	Haze	Ice	Status	—	—	30
Lv. 28	Self-Destruct	Normal	Physical	200	100	5
Lv. 32	Sludge Bomb	Poison	Special	90	100	10
Lv. 36	Toxic	Poison	Status	—	90	10
Lv. 40	Belch	Poison	Special	120	90	10
Lv. 44	Explosion	Normal	Physical	250	100	5
Lv. 48	Memento	Dark	Status	—	100	10
Lv. 52	Destiny Bond	Ghost	Status	—	—	5

TMs & HMs (32)

Method	Move	Type	Category	Power	Accuracy	PP
TM06	Toxic	Poison	Status	—	90	10
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
TM18	Rain Dance	Water	Status	—	—	5
TM24	Thunderbolt	Electric	Special	90	100	15
TM25	Thunder	Electric	Special	110	70	10
TM27	Return	Normal	Physical	var.	100	20
TM30	Shadow Ball	Ghost	Special	80	100	15
TM32	Double Team	Normal	Status	—	—	15
TM34	Shock Wave	Electric	Special	60	—	20
TM35	Flamethrower	Fire	Special	90	100	15
TM36	Sludge Bomb	Poison	Special	90	100	10
TM38	Fire Blast	Fire	Special	110	85	5
TM41	Torment	Dark	Status	—	100	15
TM42	Facade	Normal	Physical	70	100	20
TM44	Rest	Psychic	Status	—	—	5
TM45	Attract	Normal	Status	—	100	15
TM46	Thief	Dark	Physical	60	100	25
TM58	Endure	Normal	Status	—	—	10
TM61	Will-O-Wisp	Fire	Status	—	85	15
TM64	Explosion	Normal	Physical	250	100	5
TM66	Payback	Dark	Physical	50	100	10
TM70	Flash	Normal	Status	—	100	20
TM74	Gyro Ball	Steel	Physical	var.	100	5
TM79	Dark Pulse	Dark	Special	80	100	15
TM82	Sleep Talk	Normal	Status	—	—	10
TM87	Swagger	Normal	Status	—	85	15
TM90	Substitute	Normal	Status	—	—	10
TM94	Venoshock	Poison	Special	65	100	10
TM100	Clear Smog	Poison	Special	50	—	15

Move tutors (2)

Method	Move	Type	Category	Power	Accuracy	PP
Tutor	Curse	Ghost	Status	—	—	10
Tutor	Haze	Ice	Status	—	—	30

Egg moves (12)

Method	Move	Type	Category	Power	Accuracy	PP
Breeding	Curse	Ghost	Status	—	—	10
Breeding	Destiny Bond	Ghost	Status	—	—	5
Breeding	Grudge	Ghost	Status	—	—	5
Breeding	Pain Split	Normal	Status	—	—	20
Breeding	Psybeam	Psychic	Special	65	100	20
Breeding	Screech	Normal	Status	—	85	40
Breeding	Spite	Ghost	Status	—	100	10
Breeding	Spit Up	Normal	Special	var.	100	10
Breeding	Stockpile	Normal	Status	—	—	20
Breeding	Swallow	Normal	Status	—	—	10
Breeding	Toxic Spikes	Poison	Status	—	—	20
Breeding	Venom Drench	Poison	Status	—	100	20

Training & breeding

Catch rate value: 190 (not a catch percentage)
Gender ratio: 50.0% female
Egg groups: Amorphous
Growth rate: Medium Fast
EV yield: 1 Defense
Possible held items: Smoke Ball