Giga Drain is learned by 66 species by level, 217 by machine, 176 by tutor and 12 by egg

Effect, in PokéAPI's words

“Drains half the damage inflicted to heal the user.”

Who learns it

219 species in all, 4 of 19 games shown

Scarlet and Violet: 158 species

Species	Method	Level
Vileplume	Level up, Machine	1
Exeggutor	Level up, Machine	1
Bellossom	Level up, Machine	1
Whimsicott	Level up, Machine	1
Lilligant	Level up, Machine	1
Calyrex	Level up, Machine	16
Oddish	Level up, Machine	20
Gloom	Level up, Machine	20
Treecko	Level up, Machine	21
Petilil	Level up, Machine	21
Sunkern	Level up, Machine	22
Sunflora	Level up, Machine	22
Cottonee	Level up, Machine	24
Grovyle	Level up, Machine	25
Sceptile	Level up, Machine	25
Shroomish	Level up, Machine	26
Lotad	Level up, Machine	28
Foongus	Level up, Machine	28
Amoonguss	Level up, Machine	28
Hoppip	Level up, Machine	32
Snivy	Level up, Machine	34
Exeggcute	Level up, Machine	35
Virizion	Level up, Machine	35
Sandygast	Level up, Machine	35
Palossand	Level up, Machine	35
Lombre	Level up, Machine	36
Sinistea	Level up, Machine	36
Polteageist	Level up, Machine	36
Skiploom	Level up, Machine	37
Masquerain	Level up, Machine	38
Leafeon	Level up, Machine	40
Servine	Level up, Machine	40
Bramblin	Level up, Machine	40
Brambleghast	Level up, Machine	40
Turtwig	Level up, Machine	41
Chikorita	Level up, Machine	42
Poltchageist	Level up, Machine	42
Jumpluff	Level up, Machine	43
Serperior	Level up, Machine	44
Toedscool	Level up, Machine	44
Wo-Chien	Level up, Machine	45
Grotle	Level up, Machine	47
Toedscruel	Level up, Machine	48
Brute Bonnet	Level up, Machine	49
Bayleef	Level up, Machine	50
Torterra	Level up, Machine	51
Meganium	Level up, Machine	60
Bulbasaur	Machine
Ivysaur	Machine
Venusaur	Machine
Ekans	Machine
Arbok	Machine
Venonat	Machine
Venomoth	Machine
Bellsprout	Machine
Weepinbell	Machine
Victreebel	Machine
Tentacool	Machine
Tentacruel	Machine
Grimer	Machine
Muk	Machine
Gastly	Machine
Haunter	Machine
Gengar	Machine
Mew	Machine
Spinarak	Machine
Ariados	Machine
Yanma	Machine
Pineco	Machine
Forretress	Machine
Lugia	Machine
Ho-Oh	Machine
Ludicolo	Machine
Seedot	Machine
Nuzleaf	Machine
Shiftry	Machine
Surskit	Machine
Breloom	Machine
Sableye	Machine
Volbeat	Machine
Illumise	Machine
Gulpin	Machine
Swalot	Machine
Trapinch	Machine
Vibrava	Machine
Flygon	Machine
Cacnea	Machine
Cacturne	Machine
Seviper	Machine
Tropius	Machine
Kricketune	Machine
Snover	Machine
Abomasnow	Machine
Yanmega	Machine
Uxie	Machine
Shaymin	Machine
Arceus	Machine
Sewaddle	Machine
Swadloon	Machine
Leavanny	Machine
Deerling	Machine
Sawsbuck	Machine
Joltik	Machine
Galvantula	Machine
Eelektrik	Machine
Eelektross	Machine
Larvesta	Machine
Volcarona	Machine
Chespin	Machine
Quilladin	Machine
Chesnaught	Machine
Vivillon	Machine
Flabébé	Machine
Floette	Machine
Florges	Machine
Skiddo	Machine
Gogoat	Machine
Phantump	Machine
Trevenant	Machine
Rowlet	Machine
Dartrix	Machine
Decidueye	Machine
Dewpider	Machine
Araquanid	Machine
Fomantis	Machine
Lurantis	Machine
Bounsweet	Machine
Steenee	Machine
Tsareena	Machine
Comfey	Machine
Mimikyu	Machine
Grookey	Machine
Thwackey	Machine
Rillaboom	Machine
Flapple	Machine
Appletun	Machine
Hatenna	Machine
Hattrem	Machine
Hatterene	Machine
Alcremie	Machine
Frosmoth	Machine
Zarude	Machine
Sprigatito	Machine
Floragato	Machine
Meowscarada	Machine
Tarountula	Machine
Spidops	Machine
Smoliv	Machine
Dolliv	Machine
Arboliva	Machine
Capsakid	Machine
Scovillain	Machine
Slither Wing	Machine
Iron Leaves	Machine
Dipplin	Machine
Sinistcha	Machine
Ogerpon	Machine
Hydrapple	Machine

Brilliant Diamond and Shining Pearl: 101 species

Species	Method	Level
Vileplume	Level up, Machine	1
Exeggutor	Level up, Machine	1
Bellossom	Level up, Machine	1
Ludicolo	Level up, Machine	1
Breloom	Level up, Machine	1
Roserade	Level up, Machine	1
Oddish	Level up, Machine	20
Gloom	Level up, Machine	20
Treecko	Level up, Machine	21
Sunkern	Level up, Machine	22
Sunflora	Level up, Machine	22
Grovyle	Level up, Machine	25
Sceptile	Level up, Machine	25
Shroomish	Level up, Machine	26
Lotad	Level up, Machine	28
Roselia	Level up, Machine	30
Tangela	Level up, Machine	32
Beautifly	Level up, Machine	32
Tangrowth	Level up, Machine	32
Exeggcute	Level up, Machine	35
Lombre	Level up, Machine	36
Lileep	Level up, Machine	36
Cradily	Level up, Machine	36
Paras	Level up, Machine	38
Leafeon	Level up, Machine	40
Turtwig	Level up, Machine	41
Hoppip	Level up, Machine	43
Parasect	Level up, Machine	44
Grotle	Level up, Machine	47
Torterra	Level up, Machine	51
Skiploom	Level up, Machine	52
Jumpluff	Level up, Machine	59
Bulbasaur	Machine
Ivysaur	Machine
Venusaur	Machine
Butterfree	Machine
Beedrill	Machine
Ekans	Machine
Arbok	Machine
Zubat	Machine
Golbat	Machine
Venonat	Machine
Venomoth	Machine
Bellsprout	Machine
Weepinbell	Machine
Victreebel	Machine
Tentacool	Machine
Tentacruel	Machine
Grimer	Machine
Muk	Machine
Gastly	Machine
Haunter	Machine
Gengar	Machine
Kabuto	Machine
Kabutops	Machine
Mew	Machine
Chikorita	Machine
Bayleef	Machine
Meganium	Machine
Ledyba	Machine
Ledian	Machine
Spinarak	Machine
Ariados	Machine
Crobat	Machine
Natu	Machine
Xatu	Machine
Yanma	Machine
Pineco	Machine
Forretress	Machine
Lugia	Machine
Ho-Oh	Machine
Celebi	Machine
Dustox	Machine
Seedot	Machine
Nuzleaf	Machine
Shiftry	Machine
Surskit	Machine
Masquerain	Machine
Nincada	Machine
Ninjask	Machine
Shedinja	Machine
Volbeat	Machine
Illumise	Machine
Trapinch	Machine
Vibrava	Machine
Flygon	Machine
Cacnea	Machine
Cacturne	Machine
Zangoose	Machine
Seviper	Machine
Tropius	Machine
Budew	Machine
Wormadam	Machine
Mothim	Machine
Cherubi	Machine
Cherrim	Machine
Carnivine	Machine
Snover	Machine
Abomasnow	Machine
Yanmega	Machine
Uxie	Machine

Sword and Shield: 122 species

Species	Method	Level
Vileplume	Level up, Machine	1
Exeggutor	Level up, Machine	1
Bellossom	Level up, Machine	1
Ludicolo	Level up, Machine	1
Roserade	Level up, Machine	1
Whimsicott	Level up, Machine	1
Lilligant	Level up, Machine	1
Calyrex	Level up, Machine	16
Oddish	Level up, Machine	20
Gloom	Level up, Machine	20
Treecko	Level up, Machine	21
Petilil	Level up, Machine	21
Cottonee	Level up, Machine	24
Maractus	Level up, Machine	24
Grovyle	Level up, Machine	25
Sceptile	Level up, Machine	25
Lotad	Level up, Machine	28
Foongus	Level up, Machine	28
Amoonguss	Level up, Machine	28
Shelmet	Level up, Machine	28
Accelgor	Level up, Machine	28
Morelull	Level up, Machine	28
Dhelmise	Level up, Machine	28
Roselia	Level up, Machine	30
Tangela	Level up, Machine	32
Tangrowth	Level up, Machine	32
Shiinotic	Level up, Machine	32
Exeggcute	Level up, Machine	35
Virizion	Level up, Machine	35
Sandygast	Level up, Machine	35
Palossand	Level up, Machine	35
Celesteela	Level up, Machine	35
Lombre	Level up, Machine	36
Lileep	Level up, Machine	36
Cradily	Level up, Machine	36
Sinistea	Level up, Machine	36
Polteageist	Level up, Machine	36
Leafeon	Level up, Machine	40
Bulbasaur	Machine
Ivysaur	Machine
Venusaur	Machine
Butterfree	Machine
Zubat	Machine
Golbat	Machine
Tentacool	Machine
Tentacruel	Machine
Gastly	Machine
Haunter	Machine
Gengar	Machine
Kabuto	Machine
Kabutops	Machine
Mew	Machine
Crobat	Machine
Natu	Machine
Xatu	Machine
Lugia	Machine
Ho-Oh	Machine
Celebi	Machine
Seedot	Machine
Nuzleaf	Machine
Shiftry	Machine
Nincada	Machine
Ninjask	Machine
Shedinja	Machine
Trapinch	Machine
Vibrava	Machine
Flygon	Machine
Budew	Machine
Cherubi	Machine
Cherrim	Machine
Snover	Machine
Abomasnow	Machine
Uxie	Machine
Woobat	Machine
Swoobat	Machine
Trubbish	Machine
Garbodor	Machine
Karrablast	Machine
Escavalier	Machine
Frillish	Machine
Jellicent	Machine
Joltik	Machine
Galvantula	Machine
Ferroseed	Machine
Ferrothorn	Machine
Heatmor	Machine
Larvesta	Machine
Volcarona	Machine
Genesect	Machine
Phantump	Machine
Trevenant	Machine
Pumpkaboo	Machine
Gourgeist	Machine
Rowlet	Machine
Dartrix	Machine
Decidueye	Machine
Dewpider	Machine
Araquanid	Machine
Fomantis	Machine
Lurantis	Machine
Bounsweet	Machine
Steenee	Machine
Tsareena	Machine
Comfey	Machine
Mimikyu	Machine
Tapu Bulu	Machine
Kartana	Machine
Grookey	Machine
Thwackey	Machine
Rillaboom	Machine
Orbeetle	Machine
Gossifleur	Machine
Eldegoss	Machine
Flapple	Machine
Appletun	Machine
Hatenna	Machine
Hattrem	Machine
Hatterene	Machine
Cursola	Machine
Alcremie	Machine
Frosmoth	Machine
Zarude	Machine

Ultra Sun and Ultra Moon: 176 species

Species	Method	Level
Tapu Bulu	Level up, Tutor	14
Treecko	Level up, Tutor	21
Sunkern	Level up, Tutor	22
Sunflora	Level up, Tutor	22
Dhelmise	Level up, Tutor	23
Roselia	Level up, Tutor, Egg	25
Leafeon	Level up, Tutor	25
Virizion	Level up, Tutor	25
Shroomish	Level up, Tutor	26
Lileep	Level up, Tutor	26
Cradily	Level up, Tutor	26
Cottonee	Level up, Tutor	26
Petilil	Level up, Tutor	26
Maractus	Level up, Tutor	26
Foongus	Level up, Tutor	28
Amoonguss	Level up, Tutor	28
Morelull	Level up, Tutor	29
Lotad	Level up, Tutor, Egg	30
Oddish	Level up, Tutor	31
Shiinotic	Level up, Tutor	31
Celesteela	Level up, Tutor	31
Beautifly	Level up, Tutor	32
Gloom	Level up, Tutor	34
Snivy	Level up, Tutor	34
Tangela	Level up, Tutor, Egg	36
Tangrowth	Level up, Tutor	36
Sandygast	Level up, Tutor	36
Palossand	Level up, Tutor	36
Shelmet	Level up, Tutor	37
Accelgor	Level up, Tutor	37
Paras	Level up, Tutor	38
Servine	Level up, Tutor	40
Turtwig	Level up, Tutor	41
Hoppip	Level up, Tutor	43
Parasect	Level up, Tutor	44
Serperior	Level up, Tutor	44
Grotle	Level up, Tutor	47
Torterra	Level up, Tutor	51
Skiploom	Level up, Tutor	52
Jumpluff	Level up, Tutor	59
Bulbasaur	Tutor, Egg
Ivysaur	Tutor
Venusaur	Tutor
Butterfree	Tutor
Beedrill	Tutor
Ekans	Tutor
Arbok	Tutor
Zubat	Tutor, Egg
Golbat	Tutor
Vileplume	Tutor
Venonat	Tutor, Egg
Venomoth	Tutor
Bellsprout	Tutor, Egg
Weepinbell	Tutor
Victreebel	Tutor
Tentacool	Tutor
Tentacruel	Tutor
Grimer	Tutor
Muk	Tutor
Gastly	Tutor
Haunter	Tutor
Gengar	Tutor
Exeggcute	Tutor, Egg
Exeggutor	Tutor
Kabuto	Tutor, Egg
Kabutops	Tutor
Mew	Tutor
Chikorita	Tutor
Bayleef	Tutor
Meganium	Tutor
Ledyba	Tutor
Ledian	Tutor
Spinarak	Tutor
Ariados	Tutor
Crobat	Tutor
Natu	Tutor
Xatu	Tutor
Bellossom	Tutor
Yanma	Tutor
Pineco	Tutor
Forretress	Tutor
Lugia	Tutor
Ho-Oh	Tutor
Celebi	Tutor
Grovyle	Tutor
Sceptile	Tutor
Dustox	Tutor
Lombre	Tutor
Ludicolo	Tutor
Seedot	Tutor
Nuzleaf	Tutor
Shiftry	Tutor
Surskit	Tutor
Masquerain	Tutor
Breloom	Tutor
Nincada	Tutor
Ninjask	Tutor
Shedinja	Tutor
Volbeat	Tutor
Illumise	Tutor
Gulpin	Tutor
Swalot	Tutor
Trapinch	Tutor
Vibrava	Tutor
Flygon	Tutor
Cacnea	Tutor
Cacturne	Tutor
Zangoose	Tutor
Seviper	Tutor
Tropius	Tutor
Budew	Tutor, Egg
Roserade	Tutor
Wormadam	Tutor
Mothim	Tutor
Cherubi	Tutor
Cherrim	Tutor
Carnivine	Tutor, Egg
Snover	Tutor
Abomasnow	Tutor
Yanmega	Tutor
Uxie	Tutor
Shaymin	Tutor
Arceus	Tutor
Pansage	Tutor
Simisage	Tutor
Woobat	Tutor
Swoobat	Tutor
Sewaddle	Tutor
Swadloon	Tutor
Leavanny	Tutor
Whimsicott	Tutor
Lilligant	Tutor
Trubbish	Tutor
Garbodor	Tutor
Deerling	Tutor
Sawsbuck	Tutor
Karrablast	Tutor
Escavalier	Tutor
Frillish	Tutor
Jellicent	Tutor
Joltik	Tutor
Galvantula	Tutor
Ferroseed	Tutor
Ferrothorn	Tutor
Eelektrik	Tutor
Eelektross	Tutor
Heatmor	Tutor
Larvesta	Tutor
Volcarona	Tutor
Genesect	Tutor
Chespin	Tutor
Quilladin	Tutor
Chesnaught	Tutor
Vivillon	Tutor
Flabébé	Tutor
Floette	Tutor
Florges	Tutor
Skiddo	Tutor
Gogoat	Tutor
Phantump	Tutor
Trevenant	Tutor
Pumpkaboo	Tutor
Gourgeist	Tutor
Rowlet	Tutor
Dartrix	Tutor
Decidueye	Tutor
Dewpider	Tutor
Araquanid	Tutor
Fomantis	Tutor, Egg
Lurantis	Tutor
Bounsweet	Tutor
Steenee	Tutor
Tsareena	Tutor
Comfey	Tutor
Mimikyu	Tutor
Kartana	Tutor

Changed over time

2 changes since Generation II

1. Through Gen IIIPP 510 from Diamond and Pearl, Generation IV
2. Through Gen IVPower 6075 from Black and White, Generation V