Gunk Shot is learned by 13 species by level, 110 by machine, 72 by tutor and 5 by egg

Effect, in PokéAPI's words

“Has a chance to poison the target.”

Who learns it

118 species in all, 8 of 12 games shown

Scarlet and Violet: 92 species

Species	Method	Level
Swalot	Level up, Machine	1
Grimer	Level up, Machine	40
Muk	Level up, Machine	40
Shroodle	Level up, Machine	45
Ekans	Level up, Machine	49
Gulpin	Level up, Machine	49
Varoom	Level up, Machine	50
Grafaiai	Level up, Machine	51
Revavroom	Level up, Machine	58
Arbok	Level up, Machine	63
Sandslash	Machine
Meowth	Machine
Persian	Machine
Mankey	Machine
Primeape	Machine
Tentacool	Machine
Tentacruel	Machine
Gastly	Machine
Haunter	Machine
Gengar	Machine
Koffing	Machine
Weezing	Machine
Snorlax	Machine
Mew	Machine
Aipom	Machine
Gligar	Machine
Qwilfish	Machine
Teddiursa	Machine
Ursaring	Machine
Delibird	Machine
Phanpy	Machine
Donphan	Machine
Pelipper	Machine
Shroomish	Machine
Breloom	Machine
Slakoth	Machine
Vigoroth	Machine
Slaking	Machine
Zangoose	Machine
Seviper	Machine
Shuppet	Machine, Egg
Banette	Machine
Chimchar	Machine
Monferno	Machine
Infernape	Machine
Pachirisu	Machine
Ambipom	Machine
Stunky	Machine
Skuntank	Machine
Munchlax	Machine
Croagunk	Machine
Toxicroak	Machine
Gliscor	Machine
Arceus	Machine
Krookodile	Machine
Minccino	Machine
Cinccino	Machine
Frogadier	Machine
Greninja	Machine
Skrelp	Machine
Dragalge	Machine
Hoopa	Machine
Pikipek	Machine, Egg
Trumbeak	Machine, Egg
Toucannon	Machine, Egg
Crabrawler	Machine
Crabominable	Machine
Mareanie	Machine
Toxapex	Machine
Salandit	Machine
Salazzle	Machine
Passimian	Machine
Komala	Machine
Scorbunny	Machine
Raboot	Machine
Cinderace	Machine
Toxtricity	Machine
Perrserker	Machine
Eternatus	Machine
Ursaluna	Machine
Sneasler	Machine
Overqwil	Machine
Rellor	Machine
Rabsca	Machine
Glimmet	Machine
Glimmora	Machine
Annihilape	Machine
Clodsire	Machine
Okidogi	Machine
Munkidori	Machine
Fezandipiti	Machine
Pecharunt	Machine

Brilliant Diamond and Shining Pearl: 8 species

Species	Method	Level
Octillery	Level up	1
Swalot	Level up	1, 61
Grimer	Level up	40
Muk	Level up	40
Ekans	Level up	49
Gulpin	Level up, Egg	49
Arbok	Level up	63
Shuppet	Egg

Sword and Shield: 41 species

Species	Method	Level
Octillery	Level up, Machine	1
Trubbish	Level up, Machine	39
Garbodor	Level up, Machine	43
Meowth	Machine
Persian	Machine
Snorlax	Machine
Mew	Machine
Remoraid	Machine
Delibird	Machine
Mantine	Machine
Zigzagoon	Machine
Linoone	Machine
Pelipper	Machine
Munchlax	Machine
Croagunk	Machine
Toxicroak	Machine
Purrloin	Machine
Liepard	Machine
Minccino	Machine
Cinccino	Machine
Druddigon	Machine
Genesect	Machine
Diggersby	Machine
Pancham	Machine
Pangoro	Machine
Skrelp	Machine
Dragalge	Machine
Mareanie	Machine
Toxapex	Machine
Salandit	Machine
Salazzle	Machine
Passimian	Machine
Nihilego	Machine
Poipole	Machine
Naganadel	Machine
Scorbunny	Machine
Raboot	Machine
Cinderace	Machine
Toxtricity	Machine
Obstagoon	Machine
Perrserker	Machine

Ultra Sun and Ultra Moon: 72 species

Species	Method	Level
Octillery	Level up, Tutor	1
Swalot	Level up, Tutor	1, 61
Grimer	Level up, Tutor	40
Muk	Level up, Tutor	40
Trubbish	Level up, Tutor	45
Ekans	Level up, Tutor	49
Gulpin	Level up, Tutor, Egg	49
Garbodor	Level up, Tutor	54
Arbok	Level up, Tutor	63
Meowth	Tutor
Persian	Tutor
Mankey	Tutor
Primeape	Tutor
Snorlax	Tutor
Mew	Tutor
Aipom	Tutor
Teddiursa	Tutor
Ursaring	Tutor
Remoraid	Tutor
Delibird	Tutor
Mantine	Tutor
Phanpy	Tutor
Donphan	Tutor
Zigzagoon	Tutor
Linoone	Tutor
Pelipper	Tutor
Slakoth	Tutor
Vigoroth	Tutor
Slaking	Tutor
Shuppet	Tutor, Egg
Banette	Tutor
Chimchar	Tutor
Monferno	Tutor
Infernape	Tutor
Pachirisu	Tutor
Ambipom	Tutor
Munchlax	Tutor
Croagunk	Tutor
Toxicroak	Tutor
Patrat	Tutor
Watchog	Tutor
Purrloin	Tutor
Liepard	Tutor
Pansage	Tutor
Simisage	Tutor
Pansear	Tutor
Simisear	Tutor
Panpour	Tutor
Simipour	Tutor
Minccino	Tutor
Cinccino	Tutor
Druddigon	Tutor
Genesect	Tutor
Frogadier	Tutor
Greninja	Tutor
Diggersby	Tutor
Pancham	Tutor
Pangoro	Tutor
Skrelp	Tutor
Dragalge	Tutor
Hoopa	Tutor
Pikipek	Tutor
Trumbeak	Tutor
Toucannon	Tutor
Mareanie	Tutor
Toxapex	Tutor
Salandit	Tutor
Salazzle	Tutor
Passimian	Tutor
Nihilego	Tutor
Poipole	Tutor
Naganadel	Tutor

Sun and Moon: 10 species

Species	Method	Level
Octillery	Level up	1
Swalot	Level up	1, 61
Grimer	Level up	40
Muk	Level up	40
Trubbish	Level up	45
Ekans	Level up	49
Gulpin	Level up, Egg	49
Garbodor	Level up	54
Arbok	Level up	63
Shuppet	Egg

Omega Ruby and Alpha Sapphire: 60 species

Species	Method	Level
Octillery	Level up, Tutor	1
Swalot	Level up, Tutor	1, 61
Grimer	Level up, Tutor	40
Muk	Level up, Tutor	40
Trubbish	Level up, Tutor	45
Ekans	Level up, Tutor	49
Gulpin	Level up, Tutor, Egg	49
Garbodor	Level up, Tutor	54
Arbok	Level up, Tutor	63
Meowth	Tutor
Persian	Tutor
Mankey	Tutor
Primeape	Tutor
Snorlax	Tutor
Mew	Tutor
Aipom	Tutor
Teddiursa	Tutor
Ursaring	Tutor
Remoraid	Tutor
Delibird	Tutor
Mantine	Tutor
Phanpy	Tutor
Donphan	Tutor
Zigzagoon	Tutor
Linoone	Tutor
Pelipper	Tutor
Slakoth	Tutor
Vigoroth	Tutor
Slaking	Tutor
Shuppet	Egg
Chimchar	Tutor
Monferno	Tutor
Infernape	Tutor
Pachirisu	Tutor
Ambipom	Tutor
Munchlax	Tutor
Croagunk	Tutor
Toxicroak	Tutor
Patrat	Tutor
Watchog	Tutor
Purrloin	Tutor
Liepard	Tutor
Pansage	Tutor
Simisage	Tutor
Pansear	Tutor
Simisear	Tutor
Panpour	Tutor
Simipour	Tutor
Minccino	Tutor
Cinccino	Tutor
Druddigon	Tutor
Genesect	Tutor
Frogadier	Tutor
Greninja	Tutor
Diggersby	Tutor
Pancham	Tutor
Pangoro	Tutor
Skrelp	Tutor
Dragalge	Tutor
Hoopa	Tutor

X and Y: 10 species

Species	Method	Level
Octillery	Level up	1
Swalot	Level up	1, 73
Grimer	Level up	43
Trubbish	Level up	45
Ekans	Level up	49
Muk	Level up	49
Garbodor	Level up	54
Gulpin	Level up, Egg	59
Arbok	Level up	63
Shuppet	Egg

Black 2 and White 2: 52 species

Species	Method	Level
Octillery	Level up, Tutor	1
Grimer	Level up, Tutor	43
Trubbish	Level up, Tutor	45
Ekans	Level up, Tutor	49
Muk	Level up, Tutor	49
Garbodor	Level up, Tutor	54
Gulpin	Level up, Tutor, Egg	59
Arbok	Level up, Tutor	63
Swalot	Level up, Tutor	73
Meowth	Tutor
Persian	Tutor
Mankey	Tutor
Primeape	Tutor
Snorlax	Tutor
Mew	Tutor
Aipom	Tutor
Teddiursa	Tutor
Ursaring	Tutor
Remoraid	Tutor
Delibird	Tutor
Mantine	Tutor
Phanpy	Tutor
Donphan	Tutor
Zigzagoon	Tutor
Linoone	Tutor
Pelipper	Tutor
Slakoth	Tutor
Vigoroth	Tutor
Slaking	Tutor
Shuppet	Egg
Chimchar	Tutor
Monferno	Tutor
Infernape	Tutor
Pachirisu	Tutor
Ambipom	Tutor
Munchlax	Tutor
Croagunk	Tutor
Toxicroak	Tutor
Patrat	Tutor
Watchog	Tutor
Purrloin	Tutor
Liepard	Tutor
Pansage	Tutor
Simisage	Tutor
Pansear	Tutor
Simisear	Tutor
Panpour	Tutor
Simipour	Tutor
Minccino	Tutor
Cinccino	Tutor
Druddigon	Tutor
Genesect	Tutor

Changed over time

One change since Generation IV

1. Through Gen VAccuracy 70%80% from X and Y, Generation VI