Gravity is learned by 13 species by level, 85 by machine, 99 by tutor and 8 by egg

Effect, in PokéAPI's words

“Disables moves and immunities that involve flying or levitating for five turns.”

Who learns it

118 species in all, 8 of 12 games shown

Scarlet and Violet: 85 species

Species	Method	Level
Dusclops	Level up, Machine	1
Probopass	Level up, Machine	1
Dusknoir	Level up, Machine	1
Arceus	Level up, Machine	10
Stonjourner	Level up, Machine	18
Clefairy	Level up, Machine	28
Jirachi	Level up, Machine	35
Deoxys	Level up, Machine	37
Sandy Shocks	Level up, Machine	77
Necrozma	Level up, Machine	80
Clefable	Machine, Egg
Jigglypuff	Machine
Wigglytuff	Machine
Magnemite	Machine
Magneton	Machine
Exeggutor	Machine
Chansey	Machine, Egg
Porygon	Machine
Mewtwo	Machine
Mew	Machine
Cleffa	Machine
Igglybuff	Machine, Egg
Espeon	Machine
Girafarig	Machine
Pineco	Machine
Forretress	Machine
Porygon2	Machine
Stantler	Machine
Blissey	Machine, Egg
Gardevoir	Machine
Nosepass	Machine
Sableye	Machine
Medicham	Machine
Duskull	Machine
Chimecho	Machine
Metang	Machine
Metagross	Machine
Regirock	Machine
Regice	Machine
Registeel	Machine
Chingling	Machine
Bronzor	Machine, Egg
Bronzong	Machine
Happiny	Machine, Egg
Magnezone	Machine
Glaceon	Machine
Porygon-Z	Machine
Dialga	Machine
Palkia	Machine
Regigigas	Machine
Giratina	Machine
Cresselia	Machine
Gothita	Machine
Gothorita	Machine
Gothitelle	Machine
Solosis	Machine
Duosion	Machine
Reuniclus	Machine
Golett	Machine
Golurk	Machine
Landorus	Machine
Meloetta	Machine
Espurr	Machine
Meowstic	Machine
Inkay	Machine
Malamar	Machine
Carbink	Machine
Diancie	Machine
Hoopa	Machine
Oranguru	Machine
Sandygast	Machine
Palossand	Machine
Minior	Machine
Magearna	Machine
Hatterene	Machine
Indeedee	Machine
Eternatus	Machine
Calyrex	Machine
Wyrdeer	Machine
Garganacl	Machine
Rabsca	Machine
Farigiraf	Machine
Iron Leaves	Machine
Iron Crown	Machine
Terapagos	Machine

Brilliant Diamond and Shining Pearl: 9 species

Species	Method	Level
Clefable	Level up	1
Dusclops	Level up	1
Probopass	Level up	1
Dusknoir	Level up	1
Clefairy	Level up	28
Jirachi	Level up	35
Chansey	Egg
Igglybuff	Egg
Happiny	Egg

Sword and Shield: 14 species

Species	Method	Level
Clefable	Level up	1
Dusclops	Level up	1
Dusknoir	Level up	1
Xerneas	Level up	1
Necrozma	Level up	1
Sigilyph	Level up	5
Stonjourner	Level up	18
Clefairy	Level up	28
Jirachi	Level up	35
Chansey	Egg
Igglybuff	Egg
Happiny	Egg
Roggenrola	Egg
Ferroseed	Egg

Ultra Sun and Ultra Moon: 99 species

Species	Method	Level
Dusclops	Level up, Tutor	1
Probopass	Level up, Tutor	1
Dusknoir	Level up, Tutor	1
Arceus	Level up, Tutor	10
Xerneas	Level up, Tutor	18
Necrozma	Level up, Tutor	31
Sigilyph	Level up, Tutor	38
Jirachi	Level up, Tutor	45
Clefairy	Level up, Tutor	49
Clefable	Tutor
Jigglypuff	Tutor
Wigglytuff	Tutor
Abra	Tutor
Kadabra	Tutor
Alakazam	Tutor
Magnemite	Tutor
Magneton	Tutor
Exeggcute	Tutor
Exeggutor	Tutor
Chansey	Tutor, Egg
Staryu	Tutor
Starmie	Tutor
Porygon	Tutor
Mewtwo	Tutor
Mew	Tutor
Cleffa	Tutor
Igglybuff	Tutor, Egg
Girafarig	Tutor
Pineco	Tutor
Forretress	Tutor
Porygon2	Tutor
Stantler	Tutor
Blissey	Tutor
Nosepass	Tutor
Sableye	Tutor
Meditite	Tutor
Medicham	Tutor
Lunatone	Tutor
Solrock	Tutor
Baltoy	Tutor
Claydol	Tutor
Duskull	Tutor
Chimecho	Tutor
Metang	Tutor
Metagross	Tutor
Regirock	Tutor
Regice	Tutor
Registeel	Tutor
Deoxys	Tutor
Chingling	Tutor
Bronzor	Tutor
Bronzong	Tutor
Happiny	Tutor, Egg
Magnezone	Tutor
Porygon-Z	Tutor
Dialga	Tutor
Palkia	Tutor
Regigigas	Tutor
Giratina	Tutor
Cresselia	Tutor
Munna	Tutor
Musharna	Tutor
Roggenrola	Tutor, Egg
Boldore	Tutor
Gigalith	Tutor
Audino	Tutor
Gothita	Tutor
Gothorita	Tutor
Gothitelle	Tutor
Solosis	Tutor
Duosion	Tutor
Reuniclus	Tutor
Ferroseed	Tutor, Egg
Ferrothorn	Tutor
Klink	Tutor
Klang	Tutor
Klinklang	Tutor
Elgyem	Tutor
Beheeyem	Tutor
Golett	Tutor
Golurk	Tutor
Landorus	Tutor
Meloetta	Tutor
Genesect	Tutor
Espurr	Tutor
Meowstic	Tutor
Carbink	Tutor
Diancie	Tutor
Hoopa	Tutor
Oranguru	Tutor
Sandygast	Tutor
Palossand	Tutor
Minior	Tutor
Togedemaru	Tutor
Tapu Lele	Tutor
Tapu Fini	Tutor
Xurkitree	Tutor
Celesteela	Tutor
Stakataka	Tutor

Sun and Moon: 14 species

Species	Method	Level
Dusclops	Level up	1
Probopass	Level up	1
Dusknoir	Level up	1
Arceus	Level up	10
Xerneas	Level up	18
Necrozma	Level up	31
Sigilyph	Level up	38
Jirachi	Level up	45
Clefairy	Level up	49
Chansey	Egg
Igglybuff	Egg
Happiny	Egg
Roggenrola	Egg
Ferroseed	Egg

Omega Ruby and Alpha Sapphire: 88 species

Species	Method	Level
Dusclops	Level up, Tutor	1
Probopass	Level up, Tutor	1
Dusknoir	Level up, Tutor	1
Arceus	Level up, Tutor	10
Xerneas	Level up, Tutor	18
Sigilyph	Level up, Tutor	38
Jirachi	Level up, Tutor	45
Clefairy	Level up, Tutor	49
Clefable	Tutor
Jigglypuff	Tutor
Wigglytuff	Tutor
Abra	Tutor
Kadabra	Tutor
Alakazam	Tutor
Magnemite	Tutor
Magneton	Tutor
Exeggcute	Tutor
Exeggutor	Tutor
Chansey	Tutor, Egg
Staryu	Tutor
Starmie	Tutor
Porygon	Tutor
Mewtwo	Tutor
Mew	Tutor
Cleffa	Tutor
Igglybuff	Tutor, Egg
Girafarig	Tutor
Pineco	Tutor
Forretress	Tutor
Porygon2	Tutor
Stantler	Tutor
Blissey	Tutor
Nosepass	Tutor
Sableye	Tutor
Meditite	Tutor
Medicham	Tutor
Lunatone	Tutor
Solrock	Tutor
Baltoy	Tutor
Claydol	Tutor
Duskull	Tutor
Chimecho	Tutor
Metang	Tutor
Metagross	Tutor
Regirock	Tutor
Regice	Tutor
Registeel	Tutor
Deoxys	Tutor
Chingling	Tutor
Bronzor	Tutor
Bronzong	Tutor
Happiny	Tutor, Egg
Magnezone	Tutor
Porygon-Z	Tutor
Dialga	Tutor
Palkia	Tutor
Regigigas	Tutor
Giratina	Tutor
Cresselia	Tutor
Munna	Tutor
Musharna	Tutor
Roggenrola	Tutor, Egg
Boldore	Tutor
Gigalith	Tutor
Audino	Tutor
Gothita	Tutor
Gothorita	Tutor
Gothitelle	Tutor
Solosis	Tutor
Duosion	Tutor
Reuniclus	Tutor
Ferroseed	Tutor, Egg
Ferrothorn	Tutor
Klink	Tutor
Klang	Tutor
Klinklang	Tutor
Elgyem	Tutor
Beheeyem	Tutor
Golett	Tutor
Golurk	Tutor
Landorus	Tutor
Meloetta	Tutor
Genesect	Tutor
Espurr	Tutor
Meowstic	Tutor
Carbink	Tutor
Diancie	Tutor
Hoopa	Tutor

X and Y: 13 species

Species	Method	Level
Dusclops	Level up	1
Probopass	Level up	1
Dusknoir	Level up	1
Arceus	Level up	10
Xerneas	Level up	18
Sigilyph	Level up	38
Jirachi	Level up	45
Clefairy	Level up	49
Chansey	Egg
Igglybuff	Egg
Happiny	Egg
Roggenrola	Egg
Ferroseed	Egg

Black 2 and White 2: 82 species

Species	Method	Level
Dusclops	Level up, Tutor	1
Probopass	Level up, Tutor	1
Dusknoir	Level up, Tutor	1
Arceus	Level up, Tutor	10
Sigilyph	Level up, Tutor	38
Jirachi	Level up, Tutor	45
Clefairy	Level up, Tutor	49
Clefable	Tutor
Jigglypuff	Tutor
Wigglytuff	Tutor
Abra	Tutor
Kadabra	Tutor
Alakazam	Tutor
Magnemite	Tutor
Magneton	Tutor
Exeggcute	Tutor
Exeggutor	Tutor
Chansey	Tutor, Egg
Staryu	Tutor
Starmie	Tutor
Porygon	Tutor
Mewtwo	Tutor
Mew	Tutor
Cleffa	Tutor
Igglybuff	Tutor, Egg
Girafarig	Tutor
Pineco	Tutor
Forretress	Tutor
Porygon2	Tutor
Stantler	Tutor
Blissey	Tutor
Nosepass	Tutor
Sableye	Tutor
Meditite	Tutor
Medicham	Tutor
Lunatone	Tutor
Solrock	Tutor
Baltoy	Tutor
Claydol	Tutor
Duskull	Tutor
Chimecho	Tutor
Metang	Tutor
Metagross	Tutor
Regirock	Tutor
Regice	Tutor
Registeel	Tutor
Deoxys	Tutor
Chingling	Tutor
Bronzor	Tutor
Bronzong	Tutor
Happiny	Tutor, Egg
Magnezone	Tutor
Porygon-Z	Tutor
Dialga	Tutor
Palkia	Tutor
Regigigas	Tutor
Giratina	Tutor
Cresselia	Tutor
Munna	Tutor
Musharna	Tutor
Roggenrola	Tutor, Egg
Boldore	Tutor
Gigalith	Tutor
Audino	Tutor
Gothita	Tutor
Gothorita	Tutor
Gothitelle	Tutor
Solosis	Tutor
Duosion	Tutor
Reuniclus	Tutor
Ferroseed	Tutor, Egg
Ferrothorn	Tutor
Klink	Tutor
Klang	Tutor
Klinklang	Tutor
Elgyem	Tutor
Beheeyem	Tutor
Golett	Tutor
Golurk	Tutor
Landorus	Tutor
Meloetta	Tutor
Genesect	Tutor