Knock Off is learned by 50 species by level, 203 by machine, 209 by tutor and 38 by egg

Effect, in PokéAPI's words

“Target drops its held item.”

Who learns it

303 species in all, 5 of 17 games shown

Scarlet and Violet: 203 species

Species	Method	Level
Banette	Level up, Machine	Evolve
Lombre	Level up, Machine	1
Salazzle	Level up, Machine	1
Gligar	Level up, Machine	10
Corphish	Level up, Machine	16
Crawdaunt	Level up, Machine	16
Donphan	Level up, Machine	19
Makuhita	Level up, Machine	19
Hariyama	Level up, Machine	19
Deoxys	Level up, Machine	19
Gliscor	Level up, Machine	19
Grookey	Level up, Machine	20
Zorua	Level up, Machine	24
Zoroark	Level up, Machine	24
Vullaby	Level up, Machine	24
Mandibuzz	Level up, Machine	24
Thwackey	Level up, Machine	24
Rillaboom	Level up, Machine	24
Bellsprout	Level up, Machine	27
Sableye	Level up, Machine	27
Weepinbell	Level up, Machine	29
Regigigas	Level up, Machine	30
Shroodle	Level up, Machine	40
Great Tusk	Level up, Machine	42
Iron Treads	Level up, Machine	42
Grafaiai	Level up, Machine	45
Meowscarada	Level up, Machine	52
Tinkatink	Level up, Machine	52
Tinkatuff	Level up, Machine	52
Tinkaton	Level up, Machine	52
Bombirdier	Level up, Machine	53
Iron Jugulis	Level up, Machine	63
Wo-Chien	Level up, Machine	70
Iron Valiant	Level up, Machine	70
Bulbasaur	Machine
Ivysaur	Machine
Venusaur	Machine
Ekans	Machine
Arbok	Machine
Pikachu	Machine
Raichu	Machine
Sandshrew	Machine
Sandslash	Machine
Clefairy	Machine
Clefable	Machine
Jigglypuff	Machine
Wigglytuff	Machine
Meowth	Machine
Persian	Machine
Psyduck	Machine
Golduck	Machine
Poliwrath	Machine
Victreebel	Machine
Tentacool	Machine, Egg
Tentacruel	Machine, Egg
Doduo	Machine
Dodrio	Machine
Dewgong	Machine
Muk	Machine
Gengar	Machine
Drowzee	Machine
Hypno	Machine
Hitmonlee	Machine
Hitmonchan	Machine
Electabuzz	Machine
Magmar	Machine
Mewtwo	Machine
Mew	Machine
Bayleef	Machine
Meganium	Machine
Sentret	Machine
Furret	Machine
Spinarak	Machine
Ariados	Machine
Marill	Machine
Azumarill	Machine
Aipom	Machine
Scizor	Machine
Heracross	Machine
Sneasel	Machine
Phanpy	Machine
Elekid	Machine
Tyranitar	Machine
Blaziken	Machine
Swampert	Machine
Ludicolo	Machine, Egg
Nuzleaf	Machine
Shiftry	Machine
Wingull	Machine, Egg
Pelipper	Machine
Ralts	Machine, Egg
Kirlia	Machine
Gardevoir	Machine
Vigoroth	Machine
Slaking	Machine
Swalot	Machine
Cacturne	Machine
Zangoose	Machine
Seviper	Machine
Chimecho	Machine
Metagross	Machine
Chimchar	Machine
Monferno	Machine
Infernape	Machine
Empoleon	Machine
Kricketune	Machine
Ambipom	Machine
Drifloon	Machine
Drifblim	Machine
Chingling	Machine
Stunky	Machine
Skuntank	Machine
Croagunk	Machine
Toxicroak	Machine
Weavile	Machine
Electivire	Machine
Magmortar	Machine
Leafeon	Machine
Mamoswine	Machine
Gallade	Machine
Uxie	Machine
Mesprit	Machine
Azelf	Machine
Phione	Machine
Manaphy	Machine
Darkrai	Machine
Snivy	Machine
Servine	Machine
Serperior	Machine
Pignite	Machine
Emboar	Machine
Oshawott	Machine, Egg
Dewott	Machine, Egg
Samurott	Machine, Egg
Timburr	Machine
Gurdurr	Machine
Conkeldurr	Machine
Leavanny	Machine
Krokorok	Machine
Krookodile	Machine
Scraggy	Machine
Scrafty	Machine
Minccino	Machine, Egg
Cinccino	Machine, Egg
Reuniclus	Machine
Swanna	Machine
Tynamo	Machine
Eelektrik	Machine
Eelektross	Machine
Mienfoo	Machine, Egg
Mienshao	Machine, Egg
Golett	Machine
Golurk	Machine
Tornadus	Machine
Thundurus	Machine
Meloetta	Machine
Chesnaught	Machine
Inkay	Machine
Malamar	Machine
Goodra	Machine
Trevenant	Machine
Hoopa	Machine
Rowlet	Machine, Egg
Dartrix	Machine, Egg
Decidueye	Machine, Egg
Incineroar	Machine
Pikipek	Machine
Trumbeak	Machine
Toucannon	Machine
Gumshoos	Machine
Crabrawler	Machine
Crabominable	Machine
Lurantis	Machine
Salandit	Machine
Tsareena	Machine
Comfey	Machine
Oranguru	Machine
Passimian	Machine, Egg
Komala	Machine
Solgaleo	Machine
Necrozma	Machine
Greedent	Machine
Perrserker	Machine
Falinks	Machine
Morpeko	Machine
Copperajah	Machine
Zarude	Machine
Quaquaval	Machine
Tarountula	Machine
Spidops	Machine
Lokix	Machine
Pawmo	Machine
Pawmot	Machine
Toedscool	Machine, Egg
Toedscruel	Machine
Klawf	Machine, Egg
Cyclizar	Machine, Egg
Cetoddle	Machine
Cetitan	Machine
Roaring Moon	Machine
Walking Wake	Machine
Okidogi	Machine
Ogerpon	Machine

Brilliant Diamond and Shining Pearl: 37 species

Species	Method	Level
Victreebel	Level up	1
Lombre	Level up	1
Ludicolo	Level up	1
Shuppet	Level up	1, 42
Banette	Level up	1, 46
Gliscor	Level up	1, 10
Gligar	Level up	10
Absol	Level up	10
Machop	Level up, Egg	16
Machoke	Level up	16
Machamp	Level up	16
Corphish	Level up, Egg	16
Crawdaunt	Level up	16
Donphan	Level up	19
Makuhita	Level up	19
Hariyama	Level up	19
Skorupi	Level up	24
Drapion	Level up	24
Bellsprout	Level up	27
Sableye	Level up	27
Tangela	Level up	28
Tangrowth	Level up	28
Weepinbell	Level up	29
Farfetch’d	Level up	30
Regigigas	Level up	30
Lickitung	Level up	36
Lickilicky	Level up	36
Abra	Egg
Tentacool	Egg
Krabby	Egg
Omanyte	Egg
Kabuto	Egg
Ledyba	Egg
Shuckle	Egg
Wingull	Egg
Ralts	Egg
Anorith	Egg

Sword and Shield: 47 species

Species	Method	Level
Lombre	Level up	1
Ludicolo	Level up	1
Salazzle	Level up	1
Absol	Level up	10
Guzzlord	Level up	10
Machop	Level up	16
Machoke	Level up	16
Machamp	Level up	16
Corphish	Level up	16
Crawdaunt	Level up	16
Grookey	Level up	20
Skorupi	Level up	24
Drapion	Level up	24
Zorua	Level up	24
Zoroark	Level up	24
Vullaby	Level up	24
Mandibuzz	Level up	24
Thwackey	Level up	24
Rillaboom	Level up	24
Sableye	Level up	27
Tangela	Level up	28
Tangrowth	Level up	28
Farfetch’d	Level up	30
Regigigas	Level up	30
Sirfetch’d	Level up	30
Lickitung	Level up	36
Lickilicky	Level up	36
Tentacool	Egg
Krabby	Egg
Omanyte	Egg
Kabuto	Egg
Shuckle	Egg
Wingull	Egg
Ralts	Egg
Anorith	Egg
Woobat	Egg
Dwebble	Egg
Tirtouga	Egg
Archen	Egg
Minccino	Egg
Karrablast	Egg
Ferroseed	Egg
Mienfoo	Egg
Rowlet	Egg
Passimian	Egg
Nickit	Egg
Sizzlipede	Egg

Ultra Sun and Ultra Moon: 209 species

Species	Method	Level
Shuppet	Level up, Tutor	1
Banette	Level up, Tutor	1
Drapion	Level up, Tutor	1, 5
Gliscor	Level up, Tutor	1, 10
Regigigas	Level up, Tutor	1
Skorupi	Level up, Tutor	5
Gligar	Level up, Tutor	10
Farfetch’d	Level up, Tutor	13
Lickitung	Level up, Tutor	13
Lickilicky	Level up, Tutor	13
Donphan	Level up, Tutor	19
Makuhita	Level up, Tutor	19
Hariyama	Level up, Tutor	19
Deoxys	Level up, Tutor	19
Machop	Level up, Tutor, Egg	21
Machoke	Level up, Tutor	21
Machamp	Level up, Tutor	21
Corphish	Level up, Tutor, Egg	23
Crawdaunt	Level up, Tutor	23
Sableye	Level up, Tutor	26
Bellsprout	Level up, Tutor	27
Tangela	Level up, Tutor	27
Tangrowth	Level up, Tutor	27
Weepinbell	Level up, Tutor	29
Lombre	Level up, Tutor	36
Bulbasaur	Tutor
Ivysaur	Tutor
Venusaur	Tutor
Beedrill	Tutor
Pikachu	Tutor
Raichu	Tutor
Sandshrew	Tutor
Sandslash	Tutor
Clefairy	Tutor
Clefable	Tutor
Jigglypuff	Tutor
Wigglytuff	Tutor
Paras	Tutor
Parasect	Tutor
Meowth	Tutor
Persian	Tutor
Abra	Tutor, Egg
Kadabra	Tutor
Alakazam	Tutor
Victreebel	Tutor
Tentacool	Tutor, Egg
Tentacruel	Tutor
Doduo	Tutor
Dodrio	Tutor
Gastly	Tutor
Haunter	Tutor
Gengar	Tutor
Krabby	Tutor, Egg
Kingler	Tutor
Cubone	Tutor
Marowak	Tutor
Hitmonlee	Tutor
Goldeen	Tutor
Seaking	Tutor
Scyther	Tutor
Pinsir	Tutor
Omanyte	Tutor, Egg
Omastar	Tutor
Kabuto	Tutor, Egg
Kabutops	Tutor
Mew	Tutor
Sentret	Tutor
Furret	Tutor
Ledyba	Tutor, Egg
Ledian	Tutor
Marill	Tutor
Azumarill	Tutor
Aipom	Tutor
Scizor	Tutor
Shuckle	Tutor, Egg
Heracross	Tutor
Sneasel	Tutor
Phanpy	Tutor
Blaziken	Tutor
Ludicolo	Tutor
Shiftry	Tutor
Wingull	Tutor, Egg
Pelipper	Tutor
Azurill	Tutor
Mawile	Tutor
Zangoose	Tutor
Seviper	Tutor
Anorith	Tutor, Egg
Armaldo	Tutor
Kecleon	Tutor
Chimecho	Tutor
Absol	Tutor
Empoleon	Tutor
Kricketune	Tutor
Ambipom	Tutor
Drifloon	Tutor
Drifblim	Tutor
Glameow	Tutor
Purugly	Tutor
Chingling	Tutor
Croagunk	Tutor
Toxicroak	Tutor
Carnivine	Tutor
Weavile	Tutor
Leafeon	Tutor
Mamoswine	Tutor
Gallade	Tutor
Uxie	Tutor
Mesprit	Tutor
Azelf	Tutor
Phione	Tutor
Manaphy	Tutor
Darkrai	Tutor
Snivy	Tutor
Servine	Tutor
Serperior	Tutor
Samurott	Tutor
Watchog	Tutor
Purrloin	Tutor
Liepard	Tutor
Pansage	Tutor
Simisage	Tutor
Pansear	Tutor
Simisear	Tutor
Panpour	Tutor
Simipour	Tutor
Woobat	Tutor, Egg
Swoobat	Tutor
Audino	Tutor
Timburr	Tutor
Gurdurr	Tutor
Conkeldurr	Tutor
Seismitoad	Tutor
Throh	Tutor
Sawk	Tutor
Leavanny	Tutor
Cottonee	Tutor
Whimsicott	Tutor
Krokorok	Tutor
Krookodile	Tutor
Maractus	Tutor
Dwebble	Tutor
Crustle	Tutor
Scraggy	Tutor
Scrafty	Tutor
Yamask	Tutor
Cofagrigus	Tutor
Tirtouga	Tutor, Egg
Carracosta	Tutor
Archen	Tutor, Egg
Archeops	Tutor
Zorua	Tutor
Zoroark	Tutor
Minccino	Tutor, Egg
Cinccino	Tutor
Reuniclus	Tutor
Emolga	Tutor
Karrablast	Tutor, Egg
Escavalier	Tutor
Alomomola	Tutor
Ferroseed	Tutor
Ferrothorn	Tutor
Eelektrik	Tutor
Eelektross	Tutor
Cryogonal	Tutor
Accelgor	Tutor
Mienfoo	Tutor, Egg
Mienshao	Tutor
Pawniard	Tutor
Bisharp	Tutor
Vullaby	Tutor, Egg
Mandibuzz	Tutor
Heatmor	Tutor
Tornadus	Tutor
Thundurus	Tutor
Landorus	Tutor
Meloetta	Tutor
Diggersby	Tutor
Pancham	Tutor
Pangoro	Tutor
Inkay	Tutor
Malamar	Tutor
Yveltal	Tutor
Hoopa	Tutor
Incineroar	Tutor
Pikipek	Tutor
Trumbeak	Tutor
Toucannon	Tutor
Mareanie	Tutor
Toxapex	Tutor
Lurantis	Tutor
Salandit	Tutor, Egg
Salazzle	Tutor
Steenee	Tutor
Tsareena	Tutor
Oranguru	Tutor
Passimian	Tutor
Golisopod	Tutor
Komala	Tutor
Dhelmise	Tutor
Tapu Fini	Tutor
Solgaleo	Tutor
Nihilego	Tutor
Kartana	Tutor
Guzzlord	Tutor
Necrozma	Tutor
Marshadow	Tutor
Blacephalon	Tutor
Zeraora	Tutor

Sun and Moon: 42 species

Species	Method	Level
Shuppet	Level up	1
Banette	Level up	1
Drapion	Level up	1, 5
Gliscor	Level up	1, 10
Regigigas	Level up	1
Skorupi	Level up	5
Gligar	Level up	10
Farfetch’d	Level up	13
Lickitung	Level up	13
Lickilicky	Level up	13
Donphan	Level up	19
Makuhita	Level up	19
Hariyama	Level up	19
Deoxys	Level up	19
Machop	Level up, Egg	21
Machoke	Level up	21
Machamp	Level up	21
Corphish	Level up, Egg	23
Crawdaunt	Level up	23
Sableye	Level up	26
Bellsprout	Level up	27
Tangela	Level up	27
Tangrowth	Level up	27
Weepinbell	Level up	29
Lombre	Level up	36
Abra	Egg
Tentacool	Egg
Krabby	Egg
Omanyte	Egg
Kabuto	Egg
Ledyba	Egg
Shuckle	Egg
Wingull	Egg
Anorith	Egg
Woobat	Egg
Tirtouga	Egg
Archen	Egg
Minccino	Egg
Karrablast	Egg
Mienfoo	Egg
Vullaby	Egg
Salandit	Egg

Changed over time

One change since Generation III

1. Through Gen VPower 2065 from X and Y, Generation VI