Air Slash is learned by 77 species by level, 129 by machine and 6 by egg

Effect, in PokéAPI's words

“Has a chance to make the target flinch.”

Who learns it

142 species in all, 8 of 14 games shown

Scarlet and Violet: 102 species

Species	Method	Level
Charizard	Level up, Machine	Evolve
Venomoth	Level up, Machine	Evolve
Scizor	Level up, Machine	1
Pelipper	Level up, Machine	1
Rayquaza	Level up, Machine	1
Yanmega	Level up, Machine	1
Hoothoot	Level up, Machine	18
Noctowl	Level up, Machine	18
Lunala	Level up, Machine	21
Quaxly	Level up, Machine	24
Ducklett	Level up, Machine	27
Swanna	Level up, Machine	27
Quaxwell	Level up, Machine	27
Quaquaval	Level up, Machine	27
Vespiquen	Level up, Machine	28
Wingull	Level up, Machine	30
Masquerain	Level up, Machine	32
Moltres	Level up, Machine	35
Tornadus	Level up, Machine	35
Flamigo	Level up, Machine	35
Scyther	Level up, Machine	36
Tropius	Level up, Machine	36
Noibat	Level up, Machine	36
Noivern	Level up, Machine	36
Oricorio	Level up, Machine	36
Vullaby	Level up, Machine	42
Mandibuzz	Level up, Machine	42
Yanma	Level up, Machine	54
Rufflet	Level up, Machine	55
Iron Jugulis	Level up, Machine	56
Braviary	Level up, Machine	57
Articuno	Machine
Dragonite	Machine
Mew	Machine
Murkrow	Machine
Dunsparce	Machine
Delibird	Machine
Skarmory	Machine
Suicune	Machine
Lugia	Machine
Ho-Oh	Machine
Shiftry	Machine
Volbeat	Machine
Illumise	Machine
Vibrava	Machine
Flygon	Machine
Salamence	Machine
Latias	Machine
Latios	Machine
Empoleon	Machine
Starly	Machine
Staravia	Machine
Staraptor	Machine
Drifblim	Machine
Honchkrow	Machine
Lumineon	Machine
Gallade	Machine
Shaymin	Machine
Arceus	Machine
Oshawott	Machine, Egg
Dewott	Machine, Egg
Samurott	Machine, Egg
Leavanny	Machine
Pawniard	Machine
Bisharp	Machine
Volcarona	Machine
Cobalion	Machine
Terrakion	Machine
Virizion	Machine
Keldeo	Machine
Fletchling	Machine
Fletchinder	Machine
Talonflame	Machine
Vivillon	Machine
Rowlet	Machine
Dartrix	Machine
Decidueye	Machine
Pikipek	Machine
Trumbeak	Machine
Toucannon	Machine
Vikavolt	Machine
Inteleon	Machine
Rookidee	Machine
Corvisquire	Machine
Corviknight	Machine
Flapple	Machine
Cramorant	Machine
Frosmoth	Machine
Zacian	Machine
Kleavor	Machine
Squawkabilly	Machine
Wattrel	Machine
Kilowattrel	Machine
Bombirdier	Machine
Dudunsparce	Machine
Kingambit	Machine
Iron Moth	Machine
Roaring Moon	Machine
Iron Leaves	Machine
Fezandipiti	Machine
Iron Boulder	Machine
Iron Crown	Machine

Legends Arceus: 27 species

Species	Method	Level
Starly	Level up	15
Staravia	Level up	15
Staraptor	Level up	15
Scyther	Level up	18
Scizor	Level up	18
Kleavor	Level up	18
Shaymin	Level up	19
Rufflet	Level up	20
Mantine	Level up	21
Mantyke	Level up	21
Togetic	Level up	25
Yanma	Level up	25
Mothim	Level up	25
Chatot	Level up	25
Finneon	Level up	25
Lumineon	Level up	25
Togekiss	Level up	25
Yanmega	Level up	25
Rowlet	Level up	25
Dartrix	Level up	25
Vespiquen	Level up	29
Murkrow	Level up	30
Honchkrow	Level up	30
Zubat	Level up	34
Golbat	Level up	34
Crobat	Level up	34
Beautifly	Level up	34

Brilliant Diamond and Shining Pearl: 31 species

Species	Method	Level
Charizard	Level up	Evolve, 1
Xatu	Level up	Evolve, 1
Togekiss	Level up	Evolve, 1
Scizor	Level up	1
Swellow	Level up	1, 39
Pelipper	Level up	1
Rayquaza	Level up	1
Yanmega	Level up	1, 54
Hoothoot	Level up	18
Noctowl	Level up	18
Butterfree	Level up	24
Vespiquen	Level up	28
Wingull	Level up	30
Mantine	Level up	32
Mantyke	Level up	32
Taillow	Level up	33
Moltres	Level up	35
Scyther	Level up	36
Ledyba	Level up	36
Tropius	Level up	36
Masquerain	Level up	38
Mothim	Level up	41
Ledian	Level up	42
Pidgey	Level up, Egg	49
Zubat	Level up	50
Farfetch’d	Level up	50
Yanma	Level up	54
Pidgeotto	Level up	57
Pidgeot	Level up	62
Golbat	Level up	62
Crobat	Level up	62

Sword and Shield: 75 species

Species	Method	Level
Charizard	Level up, Machine	Evolve, 1
Xatu	Level up, Machine	Evolve, 1
Togekiss	Level up, Machine	Evolve, 1
Scizor	Level up, Machine	1
Pelipper	Level up, Machine	1
Rayquaza	Level up, Machine	1
Naganadel	Level up, Machine	1
Hoothoot	Level up, Machine	18
Noctowl	Level up, Machine	18
Lunala	Level up, Machine	21
Butterfree	Level up, Machine	24
Vespiquen	Level up, Machine	28
Wingull	Level up, Machine	30
Type: Null	Level up, Machine	30
Silvally	Level up, Machine	30
Mantine	Level up, Machine	32
Mantyke	Level up, Machine	32
Pidove	Level up, Machine	32
Moltres	Level up, Machine	35
Woobat	Level up, Machine	35
Swoobat	Level up, Machine	35
Sigilyph	Level up, Machine	35
Tornadus	Level up, Machine	35
Yveltal	Level up, Machine	35
Scyther	Level up, Machine	36
Noibat	Level up, Machine	36
Noivern	Level up, Machine	36
Tranquill	Level up, Machine	38
Unfezant	Level up, Machine	42
Vullaby	Level up, Machine	42
Mandibuzz	Level up, Machine	42
Zubat	Level up, Machine	50
Farfetch’d	Level up, Machine	50
Rufflet	Level up, Machine	55
Braviary	Level up, Machine	57
Golbat	Level up, Machine	62
Crobat	Level up, Machine	62
Articuno	Machine
Dragonite	Machine
Mew	Machine
Natu	Machine
Dunsparce	Machine
Skarmory	Machine
Suicune	Machine
Lugia	Machine
Ho-Oh	Machine
Shiftry	Machine
Ninjask	Machine
Vibrava	Machine
Flygon	Machine
Absol	Machine
Salamence	Machine
Latias	Machine
Latios	Machine
Gallade	Machine
Archeops	Machine
Emolga	Machine
Bisharp	Machine
Cobalion	Machine
Terrakion	Machine
Virizion	Machine
Keldeo	Machine
Aegislash	Machine
Decidueye	Machine
Vikavolt	Machine
Celesteela	Machine
Kartana	Machine
Inteleon	Machine
Rookidee	Machine
Corvisquire	Machine
Corviknight	Machine
Flapple	Machine
Cramorant	Machine
Frosmoth	Machine
Zacian	Machine

Let's Go Pikachu and Let's Go Eevee: 10 species

Species	Method	Level
Moltres	Level up	24
Pidgey	Level up	27
Butterfree	Level up	28
Farfetch’d	Level up	31
Zubat	Level up	33
Scyther	Level up	38
Pidgeotto	Level up	39
Pidgeot	Level up	43
Golbat	Level up	51
Charizard	Level up	62

Ultra Sun and Ultra Moon: 58 species

Species	Method	Level
Xatu	Level up	Evolve, 1
Charizard	Level up	1
Swellow	Level up	1, 39
Togekiss	Level up	1
Yanmega	Level up	1, 54
Vikavolt	Level up	1
Celesteela	Level up	1
Yveltal	Level up	10
Lunala	Level up	19
Ducklett	Level up	27
Swanna	Level up	27
Pidove	Level up	29
Rayquaza	Level up	30
Hoothoot	Level up	31
Tranquill	Level up	32
Woobat	Level up	32
Swoobat	Level up	32
Taillow	Level up	33
Unfezant	Level up	33
Noctowl	Level up	35
Ledyba	Level up	36
Mantine	Level up	36
Tropius	Level up	36
Mantyke	Level up	36
Oricorio	Level up	36
Vespiquen	Level up	37
Tornadus	Level up	37
Masquerain	Level up	38
Wingull	Level up	40
Zubat	Level up	41
Mothim	Level up	41
Sigilyph	Level up	41
Rufflet	Level up	41
Braviary	Level up	41
Vullaby	Level up	41
Mandibuzz	Level up	41
Ledian	Level up	42
Butterfree	Level up	43
Dunsparce	Level up	43
Skarmory	Level up	45
Golbat	Level up	48
Crobat	Level up	48
Noibat	Level up	48
Pidgey	Level up, Egg	49
Farfetch’d	Level up	49
Scyther	Level up	50
Moltres	Level up	50
Noivern	Level up	53
Naganadel	Level up	53
Yanma	Level up	54
Pidgeotto	Level up	57
Kartana	Level up	59
Type: Null	Level up	60
Silvally	Level up	60
Pidgeot	Level up	62
Oshawott	Egg
Sewaddle	Egg
Emolga	Egg

Sun and Moon: 57 species

Species	Method	Level
Xatu	Level up	Evolve, 1
Charizard	Level up	1
Swellow	Level up	1, 39
Togekiss	Level up	1
Yanmega	Level up	1, 54
Vikavolt	Level up	1
Celesteela	Level up	1
Yveltal	Level up	10
Lunala	Level up	19
Ducklett	Level up	27
Swanna	Level up	27
Pidove	Level up	29
Rayquaza	Level up	30
Hoothoot	Level up	31
Tranquill	Level up	32
Woobat	Level up	32
Swoobat	Level up	32
Taillow	Level up	33
Unfezant	Level up	33
Noctowl	Level up	35
Ledyba	Level up	36
Mantine	Level up	36
Tropius	Level up	36
Mantyke	Level up	36
Oricorio	Level up	36
Vespiquen	Level up	37
Tornadus	Level up	37
Masquerain	Level up	38
Wingull	Level up	40
Zubat	Level up	41
Dunsparce	Level up	41
Mothim	Level up	41
Sigilyph	Level up	41
Rufflet	Level up	41
Braviary	Level up	41
Vullaby	Level up	41
Mandibuzz	Level up	41
Ledian	Level up	42
Butterfree	Level up	43
Skarmory	Level up	45
Golbat	Level up	48
Crobat	Level up	48
Noibat	Level up	48
Pidgey	Level up, Egg	49
Farfetch’d	Level up	49
Scyther	Level up	50
Moltres	Level up	50
Noivern	Level up	53
Yanma	Level up	54
Pidgeotto	Level up	57
Kartana	Level up	59
Type: Null	Level up	60
Silvally	Level up	60
Pidgeot	Level up	62
Oshawott	Egg
Sewaddle	Egg
Emolga	Egg

Omega Ruby and Alpha Sapphire: 46 species

Species	Method	Level
Charizard	Level up	1
Swellow	Level up	1, 45
Togekiss	Level up	1
Yanmega	Level up	1, 54
Yveltal	Level up	10
Xatu	Level up	25
Ducklett	Level up	27
Swanna	Level up	27
Pidove	Level up	29
Rayquaza	Level up	30
Tranquill	Level up	32
Woobat	Level up	32
Swoobat	Level up	32
Hoothoot	Level up	33
Taillow	Level up	33
Unfezant	Level up	33
Mantine	Level up	36
Tropius	Level up	36
Mantyke	Level up	36
Noctowl	Level up	37
Vespiquen	Level up	37
Masquerain	Level up	38
Wingull	Level up	40
Zubat	Level up	41
Mothim	Level up	41
Sigilyph	Level up	41
Rufflet	Level up	41
Braviary	Level up	41
Vullaby	Level up	41
Mandibuzz	Level up	41
Tornadus	Level up	43
Skarmory	Level up	45
Golbat	Level up	48
Crobat	Level up	48
Noibat	Level up	48
Pidgey	Level up, Egg	49
Farfetch’d	Level up	49
Scyther	Level up	50
Moltres	Level up	50
Noivern	Level up	53
Yanma	Level up	54
Pidgeotto	Level up	57
Pidgeot	Level up	62
Oshawott	Egg
Sewaddle	Egg
Emolga	Egg

Changed over time

One change since Generation IV

1. Through Gen VPP 2015 from X and Y, Generation VI