Aura Sphere is learned by 14 species by level, 45 by machine and 1 by egg

Effect, in PokéAPI's words

“Never misses.”

Who learns it

46 species in all, 8 of 13 games shown

Scarlet and Violet: 38 species

Species	Method	Level
Lucario	Level up, Machine	Evolve
Mewtwo	Level up, Machine	40
Clauncher	Level up, Machine	40
Clawitzer	Level up, Machine	42
Mienfoo	Level up, Machine	45
Mienshao	Level up, Machine	45
Dialga	Level up, Machine	48
Palkia	Level up, Machine	48
Giratina	Level up, Machine	56
Magearna	Level up, Machine	66
Mew	Level up, Machine	90
Blastoise	Machine
Hitmonlee	Machine
Hitmonchan	Machine
Raikou	Machine
Blaziken	Machine
Gardevoir	Machine
Medicham	Machine
Zangoose	Machine
Latias	Machine
Latios	Machine
Jirachi	Machine
Infernape	Machine
Gallade	Machine
Arceus	Machine
Cobalion	Machine
Terrakion	Machine
Virizion	Machine
Keldeo	Machine
Decidueye	Machine
Kommo-o	Machine
Urshifu	Machine
Meowscarada	Machine
Armarouge	Machine
Palafin	Machine
Iron Valiant	Machine
Archaludon	Machine
Terapagos	Machine

Legends Arceus: 3 species

Species	Method	Level
Riolu	Level up	21
Lucario	Level up	21
Gardevoir	Level up	40

Brilliant Diamond and Shining Pearl: 8 species

Species	Method	Level
Lucario	Level up	Evolve, 1
Togekiss	Level up	1
Mewtwo	Level up	40
Dialga	Level up	56
Palkia	Level up	56
Giratina	Level up	63
Mew	Level up	90
Squirtle	Egg

Sword and Shield: 30 species

Species	Method	Level
Lucario	Level up, Machine	Evolve, 1
Togekiss	Level up, Machine	1
Mewtwo	Level up, Machine	40
Clauncher	Level up, Machine	40
Clawitzer	Level up, Machine	42
Mienfoo	Level up, Machine	45
Mienshao	Level up, Machine	45
Dialga	Level up, Machine	48
Palkia	Level up, Machine	48
Giratina	Level up, Machine	56
Magearna	Level up, Machine	66
Mew	Level up, Machine	90
Squirtle	Machine
Wartortle	Machine
Blastoise	Machine
Hitmonlee	Machine
Hitmonchan	Machine
Raikou	Machine
Celebi	Machine
Blaziken	Machine
Latias	Machine
Latios	Machine
Jirachi	Machine
Lopunny	Machine
Gallade	Machine
Keldeo	Machine
Kommo-o	Machine
Marshadow	Machine
Zeraora	Machine
Urshifu	Machine

Ultra Sun and Ultra Moon: 12 species

Species	Method	Level
Lucario	Level up	Evolve, 1
Clawitzer	Level up	Evolve, 1
Togekiss	Level up	1
Mienshao	Level up	1, 70
Dialga	Level up	37
Palkia	Level up	37
Giratina	Level up	37
Mienfoo	Level up	61
Mewtwo	Level up	70
Magearna	Level up	81
Mew	Level up	100
Squirtle	Egg

Sun and Moon: 12 species

Species	Method	Level
Lucario	Level up	Evolve, 1
Clawitzer	Level up	Evolve, 1
Togekiss	Level up	1
Mienshao	Level up	1, 70
Dialga	Level up	37
Palkia	Level up	37
Giratina	Level up	37
Mienfoo	Level up	61
Mewtwo	Level up	70
Magearna	Level up	81
Mew	Level up	100
Squirtle	Egg

Omega Ruby and Alpha Sapphire: 11 species

Species	Method	Level
Lucario	Level up	1, 42
Togekiss	Level up	1
Mienshao	Level up	1, 70
Clawitzer	Level up	1, 67
Dialga	Level up	37
Palkia	Level up	37
Giratina	Level up	37
Mienfoo	Level up	61
Mewtwo	Level up	70
Mew	Level up	100
Squirtle	Egg

X and Y: 11 species

Species	Method	Level
Lucario	Level up	1, 42
Togekiss	Level up	1
Mienshao	Level up	1, 70
Clawitzer	Level up	1, 67
Dialga	Level up	37
Palkia	Level up	37
Giratina	Level up	37
Mienfoo	Level up	61
Mewtwo	Level up	70
Mew	Level up	100
Squirtle	Egg

Changed over time

One change since Generation IV

1. Through Gen VPower 9080 from X and Y, Generation VI