Assurance is learned by 65 species by level, 145 by machine and 13 by egg

Effect, in PokéAPI's words

“Power is doubled if the target has already received damage this turn.”

Who learns it

181 species in all, 8 of 12 games shown

Scarlet and Violet: 49 species

Species	Method	Level
Weavile	Level up	1
Tarountula	Level up	8
Spidops	Level up	8
Axew	Level up	9
Fraxure	Level up	9
Haxorus	Level up	9
Nymble	Level up	9
Lokix	Level up	9
Girafarig	Level up	10
Varoom	Level up	10
Revavroom	Level up	10
Farigiraf	Level up	10
Drakloak	Level up	12
Dragapult	Level up	12
Iron Jugulis	Level up	14
Tauros	Level up	15
Donphan	Level up	15
Koffing	Level up	16
Weezing	Level up	16
Deino	Level up	16
Zweilous	Level up	16
Hydreigon	Level up	16
Impidimp	Level up	16
Morgrem	Level up	16
Grimmsnarl	Level up	16
Treecko	Level up	18
Grovyle	Level up	20
Sceptile	Level up	20
Poochyena	Level up	22
Meowth	Level up	24
Persian	Level up	24
Mightyena	Level up	24
Cranidos	Level up	24
Rampardos	Level up	24
Umbreon	Level up	25
Murkrow	Level up	25
Pawniard	Level up	25
Bisharp	Level up	25
Kingambit	Level up	25
Mankey	Level up	26
Primeape	Level up	26
Annihilape	Level up	26
Tepig	Level up	31
Pignite	Level up	36
Emboar	Level up	38
Doduo	Egg
Dodrio	Egg
Larvitar	Egg
Seviper	Egg

Brilliant Diamond and Shining Pearl: 34 species

Species	Method	Level
Honchkrow	Level up	1
Weavile	Level up	1
Spearow	Level up	8
Fearow	Level up	8
Girafarig	Level up	10
Tauros	Level up	15
Donphan	Level up	15
Koffing	Level up	16
Weezing	Level up	16
Treecko	Level up	18
Rattata	Level up	19
Raticate	Level up	19
Cacnea	Level up	19
Cacturne	Level up	19
Grovyle	Level up	20
Sceptile	Level up	20
Poochyena	Level up	22
Meowth	Level up	24
Persian	Level up	24
Mightyena	Level up	24
Cranidos	Level up	24
Rampardos	Level up	24
Umbreon	Level up	25
Murkrow	Level up, Egg	25
Beedrill	Level up	26
Mankey	Level up	26
Primeape	Level up	26
Doduo	Egg
Aerodactyl	Egg
Skarmory	Egg
Larvitar	Egg
Seviper	Egg
Absol	Egg
Glameow	Egg

Sword and Shield: 145 species

Species	Method	Level
Weavile	Level up, Machine	1
Axew	Level up, Machine	9
Fraxure	Level up, Machine	9
Haxorus	Level up, Machine	9
Drakloak	Level up, Machine	12
Dragapult	Level up, Machine	12
Tauros	Level up, Machine	15
Koffing	Level up, Machine	16
Weezing	Level up, Machine	16
Deino	Level up, Machine	16
Zweilous	Level up, Machine	16
Hydreigon	Level up, Machine	16
Nickit	Level up, Machine	16
Thievul	Level up, Machine	16
Impidimp	Level up, Machine	16
Morgrem	Level up, Machine	16
Grimmsnarl	Level up, Machine	16
Treecko	Level up, Machine	18
Grovyle	Level up, Machine	20
Sceptile	Level up, Machine	20
Purrloin	Level up, Machine	21
Liepard	Level up, Machine	23
Meowth	Level up, Machine	24
Persian	Level up, Machine	24
Umbreon	Level up, Machine	25
Woobat	Level up, Machine	25
Swoobat	Level up, Machine	25
Pawniard	Level up, Machine	25
Bisharp	Level up, Machine	25
Marshadow	Level up, Machine	36
Zubat	Machine
Golbat	Machine
Diglett	Machine
Dugtrio	Machine
Machamp	Machine
Kangaskhan	Machine
Scyther	Machine
Aerodactyl	Machine
Mew	Machine
Crobat	Machine
Qwilfish	Machine
Scizor	Machine
Heracross	Machine
Remoraid	Machine
Octillery	Machine
Delibird	Machine
Mantine	Machine
Skarmory	Machine
Larvitar	Machine
Pupitar	Machine
Tyranitar	Machine
Torchic	Machine
Combusken	Machine
Blaziken	Machine
Nuzleaf	Machine
Shiftry	Machine
Mawile	Machine
Carvanha	Machine
Sharpedo	Machine
Absol	Machine
Vespiquen	Machine
Buneary	Machine
Lopunny	Machine
Stunky	Machine
Skuntank	Machine
Skorupi	Machine
Drapion	Machine
Croagunk	Machine
Toxicroak	Machine
Azelf	Machine
Scolipede	Machine
Basculin	Machine
Sandile	Machine
Krokorok	Machine
Krookodile	Machine
Maractus	Machine
Scraggy	Machine
Scrafty	Machine
Archen	Machine
Archeops	Machine
Zorua	Machine
Zoroark	Machine
Ferroseed	Machine
Ferrothorn	Machine
Klink	Machine
Klang	Machine
Klinklang	Machine
Cubchoo	Machine
Beartic	Machine
Mienshao	Machine
Bouffalant	Machine
Rufflet	Machine
Braviary	Machine
Vullaby	Machine
Mandibuzz	Machine
Tornadus	Machine
Thundurus	Machine
Genesect	Machine
Binacle	Machine
Barbaracle	Machine
Tyrunt	Machine
Tyrantrum	Machine
Hawlucha	Machine
Goodra	Machine
Incineroar	Machine
Lycanroc	Machine
Passimian	Machine
Wimpod	Machine
Golisopod	Machine
Togedemaru	Machine
Dhelmise	Machine
Tapu Koko	Machine
Pheromosa	Machine
Naganadel	Machine
Zeraora	Machine
Grookey	Machine
Thwackey	Machine
Rillaboom	Machine
Scorbunny	Machine
Raboot	Machine
Cinderace	Machine
Skwovet	Machine
Greedent	Machine
Rookidee	Machine
Corvisquire	Machine
Corviknight	Machine
Chewtle	Machine
Drednaw	Machine
Cramorant	Machine
Arrokuda	Machine
Barraskewda	Machine
Obstagoon	Machine
Perrserker	Machine
Sirfetch’d	Machine
Falinks	Machine
Pincurchin	Machine
Stonjourner	Machine
Morpeko	Machine
Zacian	Machine
Eternatus	Machine
Urshifu	Machine
Zarude	Machine
Regieleki	Machine
Glastrier	Machine
Spectrier	Machine

Ultra Sun and Ultra Moon: 49 species

Species	Method	Level
Weavile	Level up	1
Swoobat	Level up	1, 12
Fraxure	Level up	1, 7
Haxorus	Level up	1, 7
Marshadow	Level up	1
Axew	Level up	7
Girafarig	Level up	10
Koffing	Level up	12
Weezing	Level up	12
Woobat	Level up	12
Donphan	Level up	15
Carvanha	Level up	15
Sharpedo	Level up	15
Sandile	Level up	16
Krokorok	Level up	16
Krookodile	Level up	16
Rattata	Level up	19
Raticate	Level up	19
Spearow	Level up	22
Poochyena	Level up	22
Fearow	Level up	23
Mightyena	Level up	24
Cranidos	Level up	24
Rampardos	Level up	24
Umbreon	Level up	25
Murkrow	Level up, Egg	25
Beedrill	Level up	26
Mankey	Level up	26
Primeape	Level up	26
Purrloin	Level up	28
Tepig	Level up	31
Liepard	Level up	31
Pawniard	Level up	33
Bisharp	Level up	33
Pignite	Level up	36
Emboar	Level up	38
Meowth	Level up	41
Persian	Level up	49
Doduo	Egg
Aerodactyl	Egg
Skarmory	Egg
Larvitar	Egg
Seviper	Egg
Absol	Egg
Glameow	Egg
Oshawott	Egg
Patrat	Egg
Cubchoo	Egg
Deino	Egg

Sun and Moon: 49 species

Species	Method	Level
Weavile	Level up	1
Swoobat	Level up	1, 12
Fraxure	Level up	1, 7
Haxorus	Level up	1, 7
Marshadow	Level up	1
Axew	Level up	7
Girafarig	Level up	10
Koffing	Level up	12
Weezing	Level up	12
Woobat	Level up	12
Donphan	Level up	15
Carvanha	Level up	15
Sharpedo	Level up	15
Sandile	Level up	16
Krokorok	Level up	16
Krookodile	Level up	16
Rattata	Level up	19
Raticate	Level up	19
Spearow	Level up	22
Poochyena	Level up	22
Fearow	Level up	23
Mightyena	Level up	24
Cranidos	Level up	24
Rampardos	Level up	24
Umbreon	Level up	25
Murkrow	Level up, Egg	25
Beedrill	Level up	26
Mankey	Level up	26
Primeape	Level up	26
Purrloin	Level up	28
Tepig	Level up	31
Liepard	Level up	31
Pawniard	Level up	33
Bisharp	Level up	33
Pignite	Level up	36
Emboar	Level up	38
Meowth	Level up	41
Persian	Level up	49
Doduo	Egg
Aerodactyl	Egg
Skarmory	Egg
Larvitar	Egg
Seviper	Egg
Absol	Egg
Glameow	Egg
Oshawott	Egg
Patrat	Egg
Cubchoo	Egg
Deino	Egg

Omega Ruby and Alpha Sapphire: 48 species

Species	Method	Level
Weavile	Level up	1
Swoobat	Level up	1, 12
Fraxure	Level up	1, 7
Haxorus	Level up	1, 7
Axew	Level up	7
Girafarig	Level up	10
Koffing	Level up	12
Weezing	Level up	12
Woobat	Level up	12
Donphan	Level up	15
Carvanha	Level up	15
Sharpedo	Level up	15
Sandile	Level up	16
Krokorok	Level up	16
Krookodile	Level up	16
Poochyena	Level up	22
Mightyena	Level up	24
Cranidos	Level up	24
Rampardos	Level up	24
Rattata	Level up	25
Mankey	Level up	25
Primeape	Level up	25
Umbreon	Level up	25
Murkrow	Level up, Egg	25
Purrloin	Level up	28
Raticate	Level up	29
Spearow	Level up	29
Tepig	Level up	31
Liepard	Level up	31
Pawniard	Level up	33
Bisharp	Level up	33
Beedrill	Level up	34
Fearow	Level up	35
Pignite	Level up	36
Emboar	Level up	38
Meowth	Level up	41
Persian	Level up	49
Doduo	Egg
Aerodactyl	Egg
Skarmory	Egg
Larvitar	Egg
Seviper	Egg
Absol	Egg
Glameow	Egg
Oshawott	Egg
Patrat	Egg
Cubchoo	Egg
Deino	Egg

X and Y: 48 species

Species	Method	Level
Weavile	Level up	1
Swoobat	Level up	1, 12
Fraxure	Level up	1, 7
Haxorus	Level up	1, 7
Axew	Level up	7
Koffing	Level up	12
Weezing	Level up	12
Woobat	Level up	12
Sandile	Level up	16
Krokorok	Level up	16
Krookodile	Level up	16
Cranidos	Level up	24
Rampardos	Level up	24
Rattata	Level up	25
Mankey	Level up	25
Primeape	Level up	25
Umbreon	Level up	25
Murkrow	Level up, Egg	25
Carvanha	Level up	26
Sharpedo	Level up	26
Girafarig	Level up	28
Purrloin	Level up	28
Raticate	Level up	29
Spearow	Level up	29
Poochyena	Level up	29
Donphan	Level up	31
Tepig	Level up	31
Liepard	Level up	31
Mightyena	Level up	32
Pawniard	Level up	33
Bisharp	Level up	33
Beedrill	Level up	34
Fearow	Level up	35
Pignite	Level up	36
Emboar	Level up	38
Meowth	Level up	41
Persian	Level up	49
Doduo	Egg
Aerodactyl	Egg
Skarmory	Egg
Larvitar	Egg
Seviper	Egg
Absol	Egg
Glameow	Egg
Oshawott	Egg
Patrat	Egg
Cubchoo	Egg
Deino	Egg

Black 2 and White 2: 48 species

Species	Method	Level
Weavile	Level up	1
Swoobat	Level up	1, 12
Fraxure	Level up	1, 7
Haxorus	Level up	1, 7
Axew	Level up	7
Koffing	Level up	12
Weezing	Level up	12
Woobat	Level up	12
Sandile	Level up	16
Krokorok	Level up	16
Krookodile	Level up	16
Cranidos	Level up	24
Rampardos	Level up	24
Rattata	Level up	25
Mankey	Level up	25
Primeape	Level up	25
Umbreon	Level up	25
Murkrow	Level up, Egg	25
Carvanha	Level up	26
Sharpedo	Level up	26
Girafarig	Level up	28
Purrloin	Level up	28
Raticate	Level up	29
Spearow	Level up	29
Poochyena	Level up	29
Donphan	Level up	31
Tepig	Level up	31
Liepard	Level up	31
Mightyena	Level up	32
Pawniard	Level up	33
Bisharp	Level up	33
Beedrill	Level up	34
Fearow	Level up	35
Pignite	Level up	36
Emboar	Level up	38
Meowth	Level up	41
Persian	Level up	49
Doduo	Egg
Aerodactyl	Egg
Skarmory	Egg
Larvitar	Egg
Seviper	Egg
Absol	Egg
Glameow	Egg
Oshawott	Egg
Patrat	Egg
Cubchoo	Egg
Deino	Egg

Changed over time

One change since Generation IV

1. Through Gen VPower 5060 from X and Y, Generation VI