Flamethrower is learned by 58 species by level, 203 by machine, 66 by tutor and 2 by egg

Effect, in PokéAPI's words

“Has a chance to burn the target.”

Who learns it

203 species in all, 5 of 25 games shown

Scarlet and Violet: 150 species

Species	Method	Level
Skuntank	Level up, Machine	Evolve
Scovillain	Level up, Machine	Evolve
Ninetales	Level up, Machine	1
Arcanine	Level up, Machine	5
Charmander	Level up, Machine	24
Fuecoco	Level up, Machine	28
Charmeleon	Level up, Machine	30
Charizard	Level up, Machine	30
Torchic	Level up, Machine	30
Litten	Level up, Machine	30
Vulpix	Level up, Machine	32
Crocalor	Level up, Machine	32
Skeledirge	Level up, Machine	32
Tepig	Level up, Machine	33
Fennekin	Level up, Machine	35
Litleo	Level up, Machine	36
Pyroar	Level up, Machine	38
Pignite	Level up, Machine	39
Growlithe	Level up, Machine	40
Cyndaquil	Level up, Machine	40
Magby	Level up, Machine	40
Torkoal	Level up, Machine	40
Reshiram	Level up, Machine	40
Torracat	Level up, Machine	40
Braixen	Level up, Machine	41
Roaring Moon	Level up, Machine	42
Numel	Level up, Machine	43
Emboar	Level up, Machine	43
Houndour	Level up, Machine	44
Incineroar	Level up, Machine	44
Bagon	Level up, Machine	45
Delphox	Level up, Machine	45
Salandit	Level up, Machine	45
Magmar	Level up, Machine	46
Quilava	Level up, Machine	46
Magmortar	Level up, Machine	46
Chimchar	Level up, Machine	47
Typhlosion	Level up, Machine	48
Slugma	Level up, Machine	48
Eternatus	Level up, Machine	48
Armarouge	Level up, Machine	48
Koraidon	Level up, Machine	49
Houndoom	Level up, Machine	50
Salazzle	Level up, Machine	51
Shelgon	Level up, Machine	53
Magcargo	Level up, Machine	54
Salamence	Level up, Machine	55
Walking Wake	Level up, Machine	77
Clefairy	Machine
Clefable	Machine
Jigglypuff	Machine
Wigglytuff	Machine
Geodude	Machine
Graveler	Machine
Golem	Machine
Slowpoke	Machine
Slowbro	Machine
Grimer	Machine
Muk	Machine
Koffing	Machine
Weezing	Machine
Rhyhorn	Machine
Rhydon	Machine
Chansey	Machine
Tauros	Machine
Gyarados	Machine
Flareon	Machine
Snorlax	Machine
Moltres	Machine
Dratini	Machine
Dragonair	Machine
Dragonite	Machine
Mewtwo	Machine
Mew	Machine
Sentret	Machine
Furret	Machine
Cleffa	Machine
Igglybuff	Machine
Slowking	Machine
Dunsparce	Machine
Snubbull	Machine
Granbull	Machine
Blissey	Machine
Entei	Machine
Tyranitar	Machine
Ho-Oh	Machine
Combusken	Machine, Egg
Blaziken	Machine, Egg
Slakoth	Machine
Vigoroth	Machine
Slaking	Machine
Camerupt	Machine
Flygon	Machine
Altaria	Machine
Zangoose	Machine
Seviper	Machine
Groudon	Machine
Rayquaza	Machine
Monferno	Machine
Infernape	Machine
Cranidos	Machine
Rampardos	Machine
Shieldon	Machine
Bastiodon	Machine
Stunky	Machine
Gible	Machine
Gabite	Machine
Garchomp	Machine
Munchlax	Machine
Rhyperior	Machine
Electivire	Machine
Azelf	Machine
Dialga	Machine
Palkia	Machine
Heatran	Machine
Arceus	Machine
Zoroark	Machine
Eelektross	Machine
Litwick	Machine
Lampent	Machine
Chandelure	Machine
Hydreigon	Machine
Larvesta	Machine
Volcarona	Machine
Fletchinder	Machine
Talonflame	Machine
Inkay	Machine
Malamar	Machine
Goodra	Machine
Noivern	Machine
Volcanion	Machine
Kommo-o	Machine
Solgaleo	Machine
Scorbunny	Machine
Raboot	Machine
Cinderace	Machine
Carkol	Machine
Coalossal	Machine
Drakloak	Machine
Dragapult	Machine
Charcadet	Machine
Ceruledge	Machine
Dudunsparce	Machine
Scream Tail	Machine
Iron Jugulis	Machine
Iron Moth	Machine
Iron Thorns	Machine
Chi-Yu	Machine
Gouging Fire	Machine
Terapagos	Machine

Legends Arceus: 12 species

Species	Method	Level
Flareon	Level up	25
Magmar	Level up	34
Cyndaquil	Level up	34
Quilava	Level up	34
Magby	Level up	34
Chimchar	Level up	34
Monferno	Level up	34
Infernape	Level up	34
Skuntank	Level up	34
Magmortar	Level up	34
Vulpix	Level up, Tutor	37
Ninetales	Level up, Tutor	37

Brilliant Diamond and Shining Pearl: 122 species

Species	Method	Level
Skuntank	Level up, Machine	Evolve, 1
Ninetales	Level up, Machine	1
Arcanine	Level up, Machine	1
Combusken	Level up, Machine	1
Blaziken	Level up, Machine	1
Camerupt	Level up, Machine	1
Monferno	Level up, Machine	1
Infernape	Level up, Machine	1
Charmander	Level up, Machine	24
Charmeleon	Level up, Machine	30
Charizard	Level up, Machine	30
Torchic	Level up, Machine	30
Vulpix	Level up, Machine	32
Growlithe	Level up, Machine	40
Cyndaquil	Level up, Machine	40
Magby	Level up, Machine	40
Torkoal	Level up, Machine	40
Numel	Level up, Machine	43
Houndour	Level up, Machine	44
Bagon	Level up, Machine	45
Magmar	Level up, Machine	46
Quilava	Level up, Machine	46
Magmortar	Level up, Machine	46
Chimchar	Level up, Machine	47
Typhlosion	Level up, Machine	48
Slugma	Level up, Machine	48
Houndoom	Level up, Machine	50
Shelgon	Level up, Machine	53
Magcargo	Level up, Machine	54
Salamence	Level up, Machine	55
Nidoqueen	Machine
Nidoking	Machine
Clefairy	Machine
Clefable	Machine
Jigglypuff	Machine
Wigglytuff	Machine
Machop	Machine
Machoke	Machine
Machamp	Machine
Geodude	Machine
Graveler	Machine
Golem	Machine
Ponyta	Machine
Rapidash	Machine
Slowpoke	Machine
Slowbro	Machine
Grimer	Machine
Muk	Machine
Cubone	Machine
Marowak	Machine
Lickitung	Machine
Koffing	Machine
Weezing	Machine
Rhyhorn	Machine
Rhydon	Machine
Chansey	Machine
Kangaskhan	Machine
Tauros	Machine
Gyarados	Machine
Flareon	Machine
Aerodactyl	Machine
Snorlax	Machine
Moltres	Machine
Dratini	Machine
Dragonair	Machine
Dragonite	Machine
Mewtwo	Machine
Mew	Machine
Sentret	Machine
Furret	Machine
Cleffa	Machine
Igglybuff	Machine
Togepi	Machine
Togetic	Machine
Slowking	Machine
Dunsparce	Machine
Snubbull	Machine
Granbull	Machine
Remoraid	Machine
Octillery	Machine
Blissey	Machine
Entei	Machine
Tyranitar	Machine
Ho-Oh	Machine
Slakoth	Machine
Vigoroth	Machine
Slaking	Machine
Whismur	Machine
Loudred	Machine
Exploud	Machine
Mawile	Machine
Aggron	Machine
Electrike	Machine
Manectric	Machine
Flygon	Machine
Altaria	Machine
Zangoose	Machine
Seviper	Machine
Solrock	Machine
Castform	Machine
Kecleon	Machine
Absol	Machine
Groudon	Machine
Rayquaza	Machine
Cranidos	Machine
Rampardos	Machine
Shieldon	Machine
Bastiodon	Machine
Stunky	Machine
Happiny	Machine
Gible	Machine
Gabite	Machine
Garchomp	Machine
Munchlax	Machine
Lickilicky	Machine
Rhyperior	Machine
Electivire	Machine
Togekiss	Machine
Azelf	Machine
Dialga	Machine
Palkia	Machine
Heatran	Machine

Sword and Shield: 140 species

Species	Method	Level
Skuntank	Level up, Machine	Evolve, 1
Ninetales	Level up, Machine	1
Arcanine	Level up, Machine	1
Combusken	Level up, Machine	1
Blaziken	Level up, Machine	1
Charmander	Level up, Machine	24
Charmeleon	Level up, Machine	30
Charizard	Level up, Machine	30
Torchic	Level up, Machine	30
Litten	Level up, Machine	30
Vulpix	Level up, Machine	32
Turtonator	Level up, Machine	36
Growlithe	Level up, Machine	40
Magby	Level up, Machine	40
Torkoal	Level up, Machine	40
Reshiram	Level up, Machine	40
Torracat	Level up, Machine	40
Incineroar	Level up, Machine	44
Bagon	Level up, Machine	45
Magmar	Level up, Machine	46
Magmortar	Level up, Machine	46
Eternatus	Level up, Machine	48
Salandit	Level up, Machine	50
Shelgon	Level up, Machine	53
Salamence	Level up, Machine	55
Salazzle	Level up, Machine	58
Nidoqueen	Machine
Nidoking	Machine
Clefairy	Machine
Clefable	Machine
Jigglypuff	Machine
Wigglytuff	Machine
Machop	Machine
Machoke	Machine
Machamp	Machine
Ponyta	Machine
Rapidash	Machine
Slowpoke	Machine
Slowbro	Machine
Cubone	Machine
Marowak	Machine
Lickitung	Machine
Koffing	Machine
Weezing	Machine
Rhyhorn	Machine
Rhydon	Machine
Chansey	Machine
Kangaskhan	Machine
Tauros	Machine
Gyarados	Machine
Flareon	Machine
Aerodactyl	Machine
Snorlax	Machine
Moltres	Machine
Dratini	Machine
Dragonair	Machine
Dragonite	Machine
Mewtwo	Machine
Mew	Machine
Cleffa	Machine
Igglybuff	Machine
Togepi	Machine
Togetic	Machine
Slowking	Machine
Dunsparce	Machine
Remoraid	Machine
Octillery	Machine
Blissey	Machine
Entei	Machine
Tyranitar	Machine
Ho-Oh	Machine
Whismur	Machine
Loudred	Machine
Exploud	Machine
Mawile	Machine
Aggron	Machine
Electrike	Machine
Manectric	Machine
Flygon	Machine
Altaria	Machine
Solrock	Machine
Absol	Machine
Groudon	Machine
Rayquaza	Machine
Stunky	Machine
Happiny	Machine
Gible	Machine
Gabite	Machine
Garchomp	Machine
Munchlax	Machine
Lickilicky	Machine
Rhyperior	Machine
Electivire	Machine
Togekiss	Machine
Azelf	Machine
Dialga	Machine
Palkia	Machine
Heatran	Machine
Victini	Machine
Audino	Machine
Darumaka	Machine
Darmanitan	Machine
Zoroark	Machine
Litwick	Machine
Lampent	Machine
Chandelure	Machine
Druddigon	Machine
Heatmor	Machine
Hydreigon	Machine
Larvesta	Machine
Volcarona	Machine
Genesect	Machine
Fletchinder	Machine
Talonflame	Machine
Swirlix	Machine
Slurpuff	Machine
Inkay	Machine
Malamar	Machine
Goodra	Machine
Pumpkaboo	Machine
Gourgeist	Machine
Noivern	Machine
Volcanion	Machine
Silvally	Machine
Drampa	Machine
Kommo-o	Machine
Solgaleo	Machine
Celesteela	Machine
Guzzlord	Machine
Naganadel	Machine
Blacephalon	Machine
Scorbunny	Machine
Raboot	Machine
Cinderace	Machine
Carkol	Machine
Coalossal	Machine
Centiskorch	Machine
Dracozolt	Machine
Drakloak	Machine
Dragapult	Machine

Let's Go Pikachu and Let's Go Eevee: 46 species

Species	Method	Level
Growlithe	Level up, Machine	17
Vulpix	Level up, Machine	24
Moltres	Level up, Machine	32
Charmander	Level up, Machine	36
Magmar	Level up, Machine	44
Charmeleon	Level up, Machine	46
Charizard	Level up, Machine	54
Nidoqueen	Machine
Nidoking	Machine
Clefairy	Machine
Clefable	Machine
Ninetales	Machine
Jigglypuff	Machine
Wigglytuff	Machine
Arcanine	Machine
Machop	Machine
Machoke	Machine
Machamp	Machine
Geodude	Machine
Graveler	Machine
Golem	Machine
Ponyta	Machine
Rapidash	Machine
Slowpoke	Machine
Slowbro	Machine
Grimer	Machine
Muk	Machine
Cubone	Machine
Marowak	Machine
Lickitung	Machine
Koffing	Machine
Weezing	Machine
Rhyhorn	Machine
Rhydon	Machine
Chansey	Machine
Kangaskhan	Machine
Tauros	Machine
Gyarados	Machine
Flareon	Machine
Aerodactyl	Machine
Snorlax	Machine
Dratini	Machine
Dragonair	Machine
Dragonite	Machine
Mewtwo	Machine
Mew	Machine

Changed over time

One change since Generation I

1. Through Gen VPower 9590 from X and Y, Generation VI