Trick Room is learned by 4 species by level and 143 by machine

Effect, in PokéAPI's words

“For five turns, slower Pokémon will act before faster Pokémon.”

Who learns it

143 species in all, 5 of 12 games shown

Scarlet and Violet: 101 species

Species	Method	Level
Porygon-Z	Level up, Machine	1
Oranguru	Level up, Machine	40
Hoopa	Level up, Machine	50
Slowpoke	Machine
Slowbro	Machine
Gastly	Machine
Haunter	Machine
Gengar	Machine
Drowzee	Machine
Hypno	Machine
Exeggutor	Machine
Porygon	Machine
Mewtwo	Machine
Mew	Machine
Espeon	Machine
Slowking	Machine
Misdreavus	Machine
Girafarig	Machine
Porygon2	Machine
Stantler	Machine
Ralts	Machine
Kirlia	Machine
Gardevoir	Machine
Meditite	Machine
Medicham	Machine
Spoink	Machine
Grumpig	Machine
Shuppet	Machine
Banette	Machine
Duskull	Machine
Dusclops	Machine
Chimecho	Machine
Jirachi	Machine
Deoxys	Machine
Drifloon	Machine
Drifblim	Machine
Mismagius	Machine
Chingling	Machine
Bronzor	Machine
Bronzong	Machine
Spiritomb	Machine
Gallade	Machine
Dusknoir	Machine
Uxie	Machine
Mesprit	Machine
Azelf	Machine
Dialga	Machine
Palkia	Machine
Cresselia	Machine
Arceus	Machine
Whimsicott	Machine
Gothita	Machine
Gothorita	Machine
Gothitelle	Machine
Solosis	Machine
Duosion	Machine
Reuniclus	Machine
Litwick	Machine
Lampent	Machine
Chandelure	Machine
Meloetta	Machine
Fennekin	Machine
Braixen	Machine
Delphox	Machine
Espurr	Machine
Meowstic	Machine
Inkay	Machine
Malamar	Machine
Carbink	Machine
Klefki	Machine
Phantump	Machine
Trevenant	Machine
Diancie	Machine
Comfey	Machine
Mimikyu	Machine
Bruxish	Machine
Solgaleo	Machine
Lunala	Machine
Necrozma	Machine
Magearna	Machine
Sinistea	Machine
Polteageist	Machine
Hatenna	Machine
Hattrem	Machine
Hatterene	Machine
Indeedee	Machine
Calyrex	Machine
Wyrdeer	Machine
Meowscarada	Machine
Armarouge	Machine
Toedscool	Machine
Toedscruel	Machine
Rabsca	Machine
Flittle	Machine
Espathra	Machine
Farigiraf	Machine
Scream Tail	Machine
Flutter Mane	Machine
Iron Valiant	Machine
Poltchageist	Machine
Sinistcha	Machine

Brilliant Diamond and Shining Pearl: 59 species

Species	Method	Level
Porygon-Z	Level up, Machine	1
Abra	Machine
Kadabra	Machine
Alakazam	Machine
Slowpoke	Machine
Slowbro	Machine
Gastly	Machine
Haunter	Machine
Gengar	Machine
Drowzee	Machine
Hypno	Machine
Exeggcute	Machine
Exeggutor	Machine
Starmie	Machine
Mr. Mime	Machine
Jynx	Machine
Porygon	Machine
Mewtwo	Machine
Mew	Machine
Natu	Machine
Xatu	Machine
Espeon	Machine
Slowking	Machine
Misdreavus	Machine
Girafarig	Machine
Porygon2	Machine
Stantler	Machine
Smoochum	Machine
Celebi	Machine
Ralts	Machine
Kirlia	Machine
Gardevoir	Machine
Spoink	Machine
Grumpig	Machine
Spinda	Machine
Lunatone	Machine
Solrock	Machine
Baltoy	Machine
Claydol	Machine
Kecleon	Machine
Shuppet	Machine
Banette	Machine
Duskull	Machine
Dusclops	Machine
Chimecho	Machine
Jirachi	Machine
Mismagius	Machine
Chingling	Machine
Bronzor	Machine
Bronzong	Machine
Mime Jr.	Machine
Gallade	Machine
Dusknoir	Machine
Uxie	Machine
Mesprit	Machine
Azelf	Machine
Dialga	Machine
Palkia	Machine
Cresselia	Machine

Sword and Shield: 97 species

Species	Method	Level
Porygon-Z	Level up, Machine	1
Oranguru	Level up, Machine	40
Abra	Machine
Kadabra	Machine
Alakazam	Machine
Slowpoke	Machine
Slowbro	Machine
Gastly	Machine
Haunter	Machine
Gengar	Machine
Exeggcute	Machine
Exeggutor	Machine
Starmie	Machine
Mr. Mime	Machine
Jynx	Machine
Porygon	Machine
Mewtwo	Machine
Mew	Machine
Natu	Machine
Xatu	Machine
Espeon	Machine
Slowking	Machine
Porygon2	Machine
Smoochum	Machine
Celebi	Machine
Ralts	Machine
Kirlia	Machine
Gardevoir	Machine
Lunatone	Machine
Solrock	Machine
Baltoy	Machine
Claydol	Machine
Duskull	Machine
Dusclops	Machine
Jirachi	Machine
Bronzor	Machine
Bronzong	Machine
Mime Jr.	Machine
Gallade	Machine
Dusknoir	Machine
Uxie	Machine
Mesprit	Machine
Azelf	Machine
Dialga	Machine
Palkia	Machine
Cresselia	Machine
Victini	Machine
Munna	Machine
Musharna	Machine
Woobat	Machine
Swoobat	Machine
Audino	Machine
Whimsicott	Machine
Sigilyph	Machine
Yamask	Machine
Cofagrigus	Machine
Gothita	Machine
Gothorita	Machine
Gothitelle	Machine
Solosis	Machine
Duosion	Machine
Reuniclus	Machine
Frillish	Machine
Jellicent	Machine
Klinklang	Machine
Elgyem	Machine
Beheeyem	Machine
Litwick	Machine
Lampent	Machine
Chandelure	Machine
Espurr	Machine
Meowstic	Machine
Spritzee	Machine
Aromatisse	Machine
Inkay	Machine
Malamar	Machine
Carbink	Machine
Phantump	Machine
Trevenant	Machine
Pumpkaboo	Machine
Gourgeist	Machine
Diancie	Machine
Comfey	Machine
Mimikyu	Machine
Solgaleo	Machine
Lunala	Machine
Nihilego	Machine
Necrozma	Machine
Magearna	Machine
Stakataka	Machine
Dottler	Machine
Orbeetle	Machine
Hatterene	Machine
Mr. Rime	Machine
Runerigus	Machine
Indeedee	Machine
Calyrex	Machine

Ultra Sun and Ultra Moon: 110 species

Species	Method	Level
Porygon-Z	Level up, Machine	1
Diancie	Level up, Machine	46
Hoopa	Level up, Machine	50
Oranguru	Level up, Machine	50
Abra	Machine
Kadabra	Machine
Alakazam	Machine
Slowpoke	Machine
Slowbro	Machine
Gastly	Machine
Haunter	Machine
Gengar	Machine
Drowzee	Machine
Hypno	Machine
Exeggcute	Machine
Exeggutor	Machine
Starmie	Machine
Mr. Mime	Machine
Jynx	Machine
Porygon	Machine
Mewtwo	Machine
Mew	Machine
Natu	Machine
Xatu	Machine
Espeon	Machine
Slowking	Machine
Misdreavus	Machine
Girafarig	Machine
Porygon2	Machine
Stantler	Machine
Smoochum	Machine
Celebi	Machine
Ralts	Machine
Kirlia	Machine
Gardevoir	Machine
Spoink	Machine
Grumpig	Machine
Spinda	Machine
Lunatone	Machine
Solrock	Machine
Baltoy	Machine
Claydol	Machine
Kecleon	Machine
Shuppet	Machine
Banette	Machine
Duskull	Machine
Dusclops	Machine
Chimecho	Machine
Jirachi	Machine
Deoxys	Machine
Mismagius	Machine
Chingling	Machine
Bronzor	Machine
Bronzong	Machine
Mime Jr.	Machine
Gallade	Machine
Dusknoir	Machine
Uxie	Machine
Mesprit	Machine
Azelf	Machine
Dialga	Machine
Palkia	Machine
Cresselia	Machine
Arceus	Machine
Victini	Machine
Munna	Machine
Musharna	Machine
Woobat	Machine
Swoobat	Machine
Audino	Machine
Whimsicott	Machine
Sigilyph	Machine
Yamask	Machine
Cofagrigus	Machine
Gothita	Machine
Gothorita	Machine
Gothitelle	Machine
Solosis	Machine
Duosion	Machine
Reuniclus	Machine
Frillish	Machine
Jellicent	Machine
Klinklang	Machine
Elgyem	Machine
Beheeyem	Machine
Litwick	Machine
Lampent	Machine
Chandelure	Machine
Meloetta	Machine
Delphox	Machine
Espurr	Machine
Meowstic	Machine
Spritzee	Machine
Aromatisse	Machine
Inkay	Machine
Malamar	Machine
Carbink	Machine
Phantump	Machine
Trevenant	Machine
Pumpkaboo	Machine
Gourgeist	Machine
Comfey	Machine
Mimikyu	Machine
Bruxish	Machine
Solgaleo	Machine
Lunala	Machine
Nihilego	Machine
Necrozma	Machine
Magearna	Machine
Stakataka	Machine

Sun and Moon: 109 species

Species	Method	Level
Porygon-Z	Level up, Machine	1
Diancie	Level up, Machine	46
Hoopa	Level up, Machine	50
Oranguru	Level up, Machine	50
Abra	Machine
Kadabra	Machine
Alakazam	Machine
Slowpoke	Machine
Slowbro	Machine
Gastly	Machine
Haunter	Machine
Gengar	Machine
Drowzee	Machine
Hypno	Machine
Exeggcute	Machine
Exeggutor	Machine
Starmie	Machine
Mr. Mime	Machine
Jynx	Machine
Porygon	Machine
Mewtwo	Machine
Mew	Machine
Natu	Machine
Xatu	Machine
Espeon	Machine
Slowking	Machine
Misdreavus	Machine
Girafarig	Machine
Porygon2	Machine
Stantler	Machine
Smoochum	Machine
Celebi	Machine
Ralts	Machine
Kirlia	Machine
Gardevoir	Machine
Spoink	Machine
Grumpig	Machine
Spinda	Machine
Lunatone	Machine
Solrock	Machine
Baltoy	Machine
Claydol	Machine
Kecleon	Machine
Shuppet	Machine
Banette	Machine
Duskull	Machine
Dusclops	Machine
Chimecho	Machine
Jirachi	Machine
Deoxys	Machine
Mismagius	Machine
Chingling	Machine
Bronzor	Machine
Bronzong	Machine
Mime Jr.	Machine
Gallade	Machine
Dusknoir	Machine
Uxie	Machine
Mesprit	Machine
Azelf	Machine
Dialga	Machine
Palkia	Machine
Cresselia	Machine
Arceus	Machine
Victini	Machine
Munna	Machine
Musharna	Machine
Woobat	Machine
Swoobat	Machine
Audino	Machine
Whimsicott	Machine
Sigilyph	Machine
Yamask	Machine
Cofagrigus	Machine
Gothita	Machine
Gothorita	Machine
Gothitelle	Machine
Solosis	Machine
Duosion	Machine
Reuniclus	Machine
Frillish	Machine
Jellicent	Machine
Klinklang	Machine
Elgyem	Machine
Beheeyem	Machine
Litwick	Machine
Lampent	Machine
Chandelure	Machine
Meloetta	Machine
Delphox	Machine
Espurr	Machine
Meowstic	Machine
Spritzee	Machine
Aromatisse	Machine
Inkay	Machine
Malamar	Machine
Carbink	Machine
Phantump	Machine
Trevenant	Machine
Pumpkaboo	Machine
Gourgeist	Machine
Comfey	Machine
Mimikyu	Machine
Bruxish	Machine
Solgaleo	Machine
Lunala	Machine
Nihilego	Machine
Necrozma	Machine
Magearna	Machine