Gastly - Generation 3 learnset

Moves learnt by level up

Gastly learns the following moves in Pokémon FireRed & LeafGreen at the levels specified.

Lv.	Move	Type	Cat.	Power	Acc.
1	Hypnosis	Psychic		—	60
1	Lick	Ghost		20	100
8	Spite	Ghost		—	100
13	Curse	???		—	—
16	Night Shade	Ghost		—	100
21	Confuse Ray	Ghost		—	100
28	Dream Eater	Psychic		100	100
33	Destiny Bond	Ghost		—	—
36	Shadow Ball	Ghost		80	100
41	Nightmare	Ghost		—	100
48	Mean Look	Normal		—	—

Egg moves

Gastly learns the following moves via breeding in Pokémon FireRed & LeafGreen. Details and compatible parents can be found below.

Move	Type	Cat.	Power	Acc.
Astonish	Ghost		30	100
Explosion	Normal		250	100
Grudge	Ghost		—	—
Haze	Ice		—	—
Perish Song	Normal		—	—
Psywave	Psychic		—	80
Will-O-Wisp	Fire		—	75

Move Tutor moves

Gastly can be taught these attacks in Pokémon FireRed & LeafGreen from move tutors (details):

Move	Type	Cat.	Power	Acc.
Dream Eater	Psychic		100	100
Explosion	Normal		250	100
Mimic	Normal		—	—
Substitute	Normal		—	—

Moves learnt by HM

Gastly does not learn any HMs in Pokémon FireRed & LeafGreen.

Moves learnt by TM

Gastly is compatible with these Technical Machines in Pokémon FireRed & LeafGreen:

TM	Move	Type	Cat.	Power	Acc.
06	Toxic	Poison		—	85
10	Hidden Power	Normal		60	100
11	Sunny Day	Fire		—	—
12	Taunt	Dark		—	100
17	Protect	Normal		—	—
18	Rain Dance	Water		—	—
19	Giga Drain	Grass		60	100
21	Frustration	Normal		—	100
24	Thunderbolt	Electric		95	100
27	Return	Normal		—	100
29	Psychic	Psychic		90	100
30	Shadow Ball	Ghost		80	100
32	Double Team	Normal		—	—
36	Sludge Bomb	Poison		90	100
41	Torment	Dark		—	100
42	Facade	Normal		70	100
43	Secret Power	Normal		70	100
44	Rest	Psychic		—	—
45	Attract	Normal		—	100
46	Thief	Dark		40	100
48	Skill Swap	Psychic		—	—
49	Snatch	Dark		—	—

Moves learnt by level up

Gastly learns the following moves in Pokémon Emerald at the levels specified.

Lv.	Move	Type	Cat.	Power	Acc.
1	Hypnosis	Psychic		—	60
1	Lick	Ghost		20	100
8	Spite	Ghost		—	100
13	Mean Look	Normal		—	—
16	Curse	???		—	—
21	Night Shade	Ghost		—	100
28	Confuse Ray	Ghost		—	100
33	Dream Eater	Psychic		100	100
36	Destiny Bond	Ghost		—	—

Egg moves

Gastly learns the following moves via breeding in Pokémon Emerald. Details and compatible parents can be found below.

Move	Type	Cat.	Power	Acc.
Astonish	Ghost		30	100
Explosion	Normal		250	100
Grudge	Ghost		—	—
Haze	Ice		—	—
Perish Song	Normal		—	—
Psywave	Psychic		—	80
Will-O-Wisp	Fire		—	75

Move Tutor moves

Gastly can be taught these attacks in Pokémon Emerald from move tutors (details):

Move	Type	Cat.	Power	Acc.
Dream Eater	Psychic		100	100
Endure	Normal		—	—
Explosion	Normal		250	100
Mimic	Normal		—	—
Psych Up	Normal		—	—
Sleep Talk	Normal		—	—
Snore	Normal		40	100
Substitute	Normal		—	—
Swagger	Normal		—	90

Moves learnt by HM

Gastly does not learn any HMs in Pokémon Emerald.

Moves learnt by TM

Gastly is compatible with these Technical Machines in Pokémon Emerald:

TM	Move	Type	Cat.	Power	Acc.
06	Toxic	Poison		—	85
10	Hidden Power	Normal		60	100
11	Sunny Day	Fire		—	—
12	Taunt	Dark		—	100
17	Protect	Normal		—	—
18	Rain Dance	Water		—	—
19	Giga Drain	Grass		60	100
21	Frustration	Normal		—	100
24	Thunderbolt	Electric		95	100
27	Return	Normal		—	100
29	Psychic	Psychic		90	100
30	Shadow Ball	Ghost		80	100
32	Double Team	Normal		—	—
36	Sludge Bomb	Poison		90	100
41	Torment	Dark		—	100
42	Facade	Normal		70	100
43	Secret Power	Normal		70	100
44	Rest	Psychic		—	—
45	Attract	Normal		—	100
46	Thief	Dark		40	100
48	Skill Swap	Psychic		—	—
49	Snatch	Dark		—	—