Gastly - Generation 7 learnset

Moves learnt by level up

Gastly learns the following moves in Pokémon Ultra Sun & Ultra Moon at the levels specified.

Lv.	Move	Type	Cat.	Power	Acc.
1	Hypnosis	Psychic		—	60
1	Lick	Ghost		30	100
5	Spite	Ghost		—	100
8	Mean Look	Normal		—	—
12	Curse	Ghost		—	—
15	Night Shade	Ghost		—	100
19	Confuse Ray	Ghost		—	100
22	Sucker Punch	Dark		70	100
26	Payback	Dark		50	100
29	Shadow Ball	Ghost		80	100
33	Dream Eater	Psychic		100	100
36	Dark Pulse	Dark		80	100
40	Destiny Bond	Ghost		—	—
43	Hex	Ghost		65	100
47	Nightmare	Ghost		—	100

Egg moves

Gastly learns the following moves via breeding in Pokémon Ultra Sun & Ultra Moon. Details and compatible parents can be found below.

Move	Type	Cat.	Power	Acc.
Astonish	Ghost		30	100
Clear Smog	Poison		50	—
Disable	Normal		—	100
Fire Punch	Fire		75	100
Grudge	Ghost		—	—
Haze	Ice		—	—
Ice Punch	Ice		75	100
Perish Song	Normal		—	—
Psywave	Psychic		—	100
Reflect Type	Normal		—	—
Scary Face	Normal		—	100
Smog	Poison		30	70
Thunder Punch	Electric		75	100

Move Tutor moves

Gastly can be taught these attacks in Pokémon Ultra Sun & Ultra Moon from move tutors (details):

Move	Type	Cat.	Power	Acc.
Ally Switch	Psychic		—	—
Fire Punch	Fire		75	100
Foul Play	Dark		95	100
Giga Drain	Grass		75	100
Ice Punch	Ice		75	100
Icy Wind	Ice		55	95
Knock Off	Dark		65	100
Pain Split	Normal		—	—
Skill Swap	Psychic		—	—
Snatch	Dark		—	—
Snore	Normal		50	100
Spite	Ghost		—	100
Telekinesis	Psychic		—	—
Thunder Punch	Electric		75	100
Trick	Psychic		—	100
Uproar	Normal		90	100
Wonder Room	Psychic		—	—

Moves learnt by TM

Gastly is compatible with these Technical Machines in Pokémon Ultra Sun & Ultra Moon:

TM	Move	Type	Cat.	Power	Acc.
06	Toxic	Poison		—	90
09	Venoshock	Poison		65	100
10	Hidden Power	Normal		60	100
11	Sunny Day	Fire		—	—
12	Taunt	Dark		—	100
17	Protect	Normal		—	—
18	Rain Dance	Water		—	—
21	Frustration	Normal		—	100
24	Thunderbolt	Electric		90	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
44	Rest	Psychic		—	—
45	Attract	Normal		—	100
46	Thief	Dark		60	100
48	Round	Normal		60	100
53	Energy Ball	Grass		90	100
61	Will-O-Wisp	Fire		—	85
63	Embargo	Dark		—	100
64	Explosion	Normal		250	100
66	Payback	Dark		50	100
77	Psych Up	Normal		—	—
83	Infestation	Bug		20	100
85	Dream Eater	Psychic		100	100
87	Swagger	Normal		—	85
88	Sleep Talk	Normal		—	—
90	Substitute	Normal		—	—
92	Trick Room	Psychic		—	—
97	Dark Pulse	Dark		80	100
99	Dazzling Gleam	Fairy		80	100
100	Confide	Normal		—	—

Moves learnt by level up

Gastly learns the following moves in Pokémon Let's Go Pikachu & Let's Go Eevee at the levels specified.

Lv.	Move	Type	Cat.	Power	Acc.
1	Hypnosis	Psychic		—	60
1	Lick	Ghost		30	100
1	Smog	Poison		30	70
5	Confuse Ray	Ghost		—	100
7	Poison Gas	Poison		—	90
12	Night Shade	Ghost		—	100
14	Will-O-Wisp	Fire		—	85
19	Sucker Punch	Dark		70	100
21	Toxic	Poison		—	90
26	Shadow Ball	Ghost		80	100
28	Dark Pulse	Dark		80	100
33	Dream Eater	Psychic		100	100

Moves learnt by TM

Gastly is compatible with these Technical Machines in Pokémon Let's Go Pikachu & Let's Go Eevee:

TM	Move	Type	Cat.	Power	Acc.
01	Headbutt	Normal		70	100
02	Taunt	Dark		—	100
05	Rest	Psychic		—	—
07	Protect	Normal		—	—
08	Substitute	Normal		—	—
11	Will-O-Wisp	Fire		—	85
12	Facade	Normal		70	100
20	Dark Pulse	Dark		80	100
21	Foul Play	Dark		95	100
23	Thunder Punch	Electric		75	100
27	Toxic	Poison		—	90
31	Fire Punch	Fire		75	100
32	Dazzling Gleam	Fairy		80	100
35	Ice Punch	Ice		75	100
36	Thunderbolt	Electric		90	100
38	Thunder	Electric		110	70
40	Psychic	Psychic		90	100
42	Self-Destruct	Normal		200	100
43	Shadow Ball	Ghost		80	100
52	Sludge Bomb	Poison		90	100
53	Mega Drain	Grass		75	100
59	Dream Eater	Psychic		100	100