Brine is learned by 47 species by level, 99 by machine and 15 by egg

Effect, in PokéAPI's words

“Has double power against Pokémon that have less than half their max HP remaining.”

Who learns it

105 species in all, 8 of 12 games shown

Scarlet and Violet: 15 species

Species	Method	Level
Hariyama	Level up	1
Gyarados	Level up	12
Cubchoo	Level up	15
Beartic	Level up	15
Qwilfish	Level up	24
Overqwil	Level up	24
Piplup	Level up	29
Seel	Level up	33
Dewgong	Level up	33
Prinplup	Level up	33
Empoleon	Level up	33
Lapras	Level up	35
Alomomola	Level up	41
Ducklett	Egg
Swanna	Egg

Brilliant Diamond and Shining Pearl: 71 species

Species	Method	Level
Starmie	Level up, Machine	1
Hariyama	Level up, Machine	1
Gyarados	Level up, Machine	12
Huntail	Level up, Machine	19
Luvdisc	Level up, Machine	22
Qwilfish	Level up, Machine	24
Wailmer	Level up, Machine	24
Wailord	Level up, Machine	24
Lileep	Level up, Machine	24
Cradily	Level up, Machine	24
Anorith	Level up, Machine	24
Armaldo	Level up, Machine	24
Spheal	Level up, Machine	24
Sealeo	Level up, Machine	24
Walrein	Level up, Machine	24
Staryu	Level up, Machine	28
Piplup	Level up, Machine	29
Seel	Level up, Machine	33
Dewgong	Level up, Machine	33
Prinplup	Level up, Machine	33
Empoleon	Level up, Machine	33
Lapras	Level up, Machine	35
Omanyte	Level up, Machine	35
Omastar	Level up, Machine	35
Kabuto	Level up, Machine	35
Kabutops	Level up, Machine	35
Squirtle	Machine
Wartortle	Machine
Blastoise	Machine
Psyduck	Machine
Golduck	Machine
Tentacool	Machine
Tentacruel	Machine
Slowpoke	Machine
Slowbro	Machine
Shellder	Machine
Cloyster	Machine
Krabby	Machine
Kingler	Machine
Horsea	Machine
Seadra	Machine
Vaporeon	Machine
Mew	Machine
Chinchou	Machine
Lanturn	Machine
Slowking	Machine
Corsola	Machine
Remoraid	Machine
Octillery	Machine
Mantine	Machine
Kingdra	Machine
Suicune	Machine
Lugia	Machine
Wingull	Machine
Pelipper	Machine
Carvanha	Machine
Sharpedo	Machine
Feebas	Machine
Milotic	Machine
Clamperl	Machine
Gorebyss	Machine
Relicanth	Machine
Kyogre	Machine
Buizel	Machine
Floatzel	Machine
Shellos	Machine
Gastrodon	Machine
Finneon	Machine
Lumineon	Machine
Palkia	Machine
Manaphy	Machine

Sword and Shield: 82 species

Species	Method	Level
Starmie	Level up, Machine	1
Gyarados	Level up, Machine	12
Wishiwashi	Level up, Machine	12
Cubchoo	Level up, Machine	15
Beartic	Level up, Machine	15
Tirtouga	Level up, Machine	21
Carracosta	Level up, Machine	21
Qwilfish	Level up, Machine	24
Wailmer	Level up, Machine	24
Wailord	Level up, Machine	24
Lileep	Level up, Machine	24
Cradily	Level up, Machine	24
Anorith	Level up, Machine	24
Armaldo	Level up, Machine	24
Spheal	Level up, Machine	24
Sealeo	Level up, Machine	24
Walrein	Level up, Machine	24
Frillish	Level up, Machine	24
Jellicent	Level up, Machine	24
Tapu Fini	Level up, Machine	25
Staryu	Level up, Machine	28
Lapras	Level up, Machine	35
Omanyte	Level up, Machine	35
Omastar	Level up, Machine	35
Kabuto	Level up, Machine	35
Kabutops	Level up, Machine	35
Squirtle	Machine
Wartortle	Machine
Blastoise	Machine
Psyduck	Machine
Golduck	Machine
Tentacool	Machine
Tentacruel	Machine
Slowpoke	Machine
Slowbro	Machine
Shellder	Machine
Cloyster	Machine
Krabby	Machine
Kingler	Machine
Horsea	Machine
Seadra	Machine
Vaporeon	Machine
Mew	Machine
Chinchou	Machine
Lanturn	Machine
Slowking	Machine
Corsola	Machine
Remoraid	Machine
Octillery	Machine
Mantine	Machine
Kingdra	Machine
Suicune	Machine
Lugia	Machine
Wingull	Machine
Pelipper	Machine
Carvanha	Machine
Sharpedo	Machine
Feebas	Machine
Milotic	Machine
Relicanth	Machine
Kyogre	Machine
Shellos	Machine
Gastrodon	Machine
Palkia	Machine
Basculin	Machine
Popplio	Machine
Brionne	Machine
Primarina	Machine
Mareanie	Machine
Toxapex	Machine
Sandygast	Machine
Palossand	Machine
Dhelmise	Machine
Clobbopus	Machine
Grapploct	Machine
Cursola	Machine
Pincurchin	Machine
Eiscue	Machine
Dracovish	Machine
Arctovish	Machine
Drakloak	Machine
Dragapult	Machine

Ultra Sun and Ultra Moon: 54 species

Species	Method	Level
Hariyama	Level up	1
Wishiwashi	Level up	14
Spheal	Level up	17
Sealeo	Level up	17
Walrein	Level up	19
Huntail	Level up	19
Lileep	Level up	21
Cradily	Level up	21
Cubchoo	Level up	21
Beartic	Level up	21
Pelipper	Level up	22
Wailmer	Level up	25
Wailord	Level up	25
Corsola	Level up	27
Staryu	Level up	28
Omanyte	Level up	28
Omastar	Level up	28
Tirtouga	Level up	28
Carracosta	Level up	28
Anorith	Level up	29
Armaldo	Level up	29
Piplup	Level up	29
Horsea	Level up	31
Seadra	Level up	31
Kingdra	Level up	31
Frillish	Level up	32
Jellicent	Level up	32
Tapu Fini	Level up	32
Seel	Level up	33
Dewgong	Level up	33
Qwilfish	Level up, Egg	33
Prinplup	Level up	33
Empoleon	Level up	33
Tentacool	Level up	34
Panpour	Level up	34
Tentacruel	Level up	36
Lapras	Level up	37
Krabby	Level up	39
Alomomola	Level up	41
Shellder	Level up	44
Kingler	Level up	51
Squirtle	Egg
Chinchou	Egg
Wingull	Egg
Carvanha	Egg
Feebas	Egg
Clamperl	Egg
Relicanth	Egg
Luvdisc	Egg
Shellos	Egg
Finneon	Egg
Oshawott	Egg
Basculin	Egg
Ducklett	Egg

Sun and Moon: 54 species

Species	Method	Level
Hariyama	Level up	1
Wishiwashi	Level up	14
Spheal	Level up	17
Sealeo	Level up	17
Walrein	Level up	19
Huntail	Level up	19
Lileep	Level up	21
Cradily	Level up	21
Cubchoo	Level up	21
Beartic	Level up	21
Pelipper	Level up	22
Wailmer	Level up	25
Wailord	Level up	25
Corsola	Level up	27
Staryu	Level up	28
Omanyte	Level up	28
Omastar	Level up	28
Tirtouga	Level up	28
Carracosta	Level up	28
Anorith	Level up	29
Armaldo	Level up	29
Piplup	Level up	29
Horsea	Level up	31
Seadra	Level up	31
Kingdra	Level up	31
Frillish	Level up	32
Jellicent	Level up	32
Tapu Fini	Level up	32
Seel	Level up	33
Dewgong	Level up	33
Qwilfish	Level up, Egg	33
Prinplup	Level up	33
Empoleon	Level up	33
Tentacool	Level up	34
Panpour	Level up	34
Tentacruel	Level up	36
Lapras	Level up	37
Krabby	Level up	39
Alomomola	Level up	41
Shellder	Level up	44
Kingler	Level up	51
Squirtle	Egg
Chinchou	Egg
Wingull	Egg
Carvanha	Egg
Feebas	Egg
Clamperl	Egg
Relicanth	Egg
Luvdisc	Egg
Shellos	Egg
Finneon	Egg
Oshawott	Egg
Basculin	Egg
Ducklett	Egg

Omega Ruby and Alpha Sapphire: 52 species

Species	Method	Level
Hariyama	Level up	1
Spheal	Level up	17
Sealeo	Level up	17
Walrein	Level up	19
Huntail	Level up	19
Lileep	Level up	21
Cradily	Level up	21
Cubchoo	Level up	21
Beartic	Level up	21
Wailmer	Level up	25
Corsola	Level up	27
Staryu	Level up	28
Omanyte	Level up	28
Omastar	Level up	28
Pelipper	Level up	28
Tirtouga	Level up	28
Carracosta	Level up	28
Wailord	Level up	29
Anorith	Level up	29
Armaldo	Level up	29
Piplup	Level up	29
Horsea	Level up	31
Seadra	Level up	31
Kingdra	Level up	31
Frillish	Level up	32
Jellicent	Level up	32
Seel	Level up	33
Dewgong	Level up	33
Qwilfish	Level up, Egg	33
Prinplup	Level up	33
Empoleon	Level up	33
Tentacool	Level up	34
Panpour	Level up	34
Tentacruel	Level up	36
Lapras	Level up	37
Krabby	Level up	39
Alomomola	Level up	41
Shellder	Level up	44
Kingler	Level up	51
Squirtle	Egg
Chinchou	Egg
Wingull	Egg
Carvanha	Egg
Feebas	Egg
Clamperl	Egg
Relicanth	Egg
Luvdisc	Egg
Shellos	Egg
Finneon	Egg
Oshawott	Egg
Basculin	Egg
Ducklett	Egg

X and Y: 42 species

Species	Method	Level
Hariyama	Level up	1
Cubchoo	Level up	21
Beartic	Level up	21
Omanyte	Level up	28
Omastar	Level up	28
Huntail	Level up	28
Tirtouga	Level up	28
Carracosta	Level up	28
Piplup	Level up	29
Horsea	Level up	30
Seadra	Level up	30
Kingdra	Level up	30
Wailmer	Level up	31
Wailord	Level up	31
Frillish	Level up	32
Jellicent	Level up	32
Seel	Level up	33
Dewgong	Level up	33
Qwilfish	Level up, Egg	33
Prinplup	Level up	33
Empoleon	Level up	33
Pelipper	Level up	34
Panpour	Level up	34
Staryu	Level up	36
Lapras	Level up	37
Krabby	Level up	39
Alomomola	Level up	41
Shellder	Level up	44
Kingler	Level up	51
Squirtle	Egg
Chinchou	Egg
Wingull	Egg
Carvanha	Egg
Feebas	Egg
Clamperl	Egg
Relicanth	Egg
Luvdisc	Egg
Shellos	Egg
Finneon	Egg
Oshawott	Egg
Basculin	Egg
Ducklett	Egg

Black 2 and White 2: 42 species

Species	Method	Level
Hariyama	Level up	1
Cubchoo	Level up	21
Beartic	Level up	21
Omanyte	Level up	28
Omastar	Level up	28
Huntail	Level up	28
Tirtouga	Level up	28
Carracosta	Level up	28
Piplup	Level up	29
Horsea	Level up	30
Seadra	Level up	30
Kingdra	Level up	30
Wailmer	Level up	31
Wailord	Level up	31
Frillish	Level up	32
Jellicent	Level up	32
Seel	Level up	33
Dewgong	Level up	33
Qwilfish	Level up, Egg	33
Prinplup	Level up	33
Empoleon	Level up	33
Pelipper	Level up	34
Panpour	Level up	34
Staryu	Level up	36
Lapras	Level up	37
Krabby	Level up	39
Alomomola	Level up	41
Shellder	Level up	44
Kingler	Level up	51
Squirtle	Egg
Chinchou	Egg
Wingull	Egg
Carvanha	Egg
Feebas	Egg
Clamperl	Egg
Relicanth	Egg
Luvdisc	Egg
Shellos	Egg
Finneon	Egg
Oshawott	Egg
Basculin	Egg
Ducklett	Egg