Wake-Up Slap is learned by 22 species by level and 8 by egg

Effect, in PokéAPI's words

“If the target is asleep, has double power and wakes it up.”

Who learns it

29 species in all, 8 of 9 games shown

Ultra Sun and Ultra Moon: 29 species

Species	Method	Level
Solgaleo	Level up	1
Timburr	Level up	20
Gurdurr	Level up	20
Conkeldurr	Level up	20
Clefairy	Level up	22
Jigglypuff	Level up	27
Machop	Level up	27
Machoke	Level up	27
Machamp	Level up	27
Skitty	Level up	28
Drowzee	Level up	29
Hypno	Level up	29
Alomomola	Level up	29
Minccino	Level up	31
Jynx	Level up	33
Makuhita	Level up, Egg	34
Poliwag	Level up	35
Froslass	Level up	37
Hariyama	Level up	38
Poliwhirl	Level up	43
Miltank	Level up	50
Meloetta	Level up	50
Tangela	Egg
Mr. Mime	Egg
Smoochum	Egg
Shroomish	Egg
Glameow	Egg
Mime Jr.	Egg
Croagunk	Egg

Sun and Moon: 26 species

Species	Method	Level
Solgaleo	Level up	1
Timburr	Level up	20
Gurdurr	Level up	20
Conkeldurr	Level up	20
Clefairy	Level up	22
Jigglypuff	Level up	27
Machop	Level up	27
Machoke	Level up	27
Machamp	Level up	27
Skitty	Level up	28
Alomomola	Level up	29
Minccino	Level up	31
Jynx	Level up	33
Makuhita	Level up, Egg	34
Poliwag	Level up	35
Froslass	Level up	37
Hariyama	Level up	38
Poliwhirl	Level up	43
Miltank	Level up	50
Meloetta	Level up	50
Mr. Mime	Egg
Smoochum	Egg
Shroomish	Egg
Glameow	Egg
Mime Jr.	Egg
Croagunk	Egg

Omega Ruby and Alpha Sapphire: 25 species

Species	Method	Level
Timburr	Level up	20
Gurdurr	Level up	20
Conkeldurr	Level up	20
Clefairy	Level up	22
Machop	Level up	27
Machoke	Level up	27
Machamp	Level up	27
Jigglypuff	Level up	28
Skitty	Level up	28
Alomomola	Level up	29
Minccino	Level up	31
Jynx	Level up	33
Makuhita	Level up, Egg	34
Poliwag	Level up	35
Froslass	Level up	37
Hariyama	Level up	38
Poliwhirl	Level up	43
Miltank	Level up	50
Meloetta	Level up	50
Mr. Mime	Egg
Smoochum	Egg
Shroomish	Egg
Glameow	Egg
Mime Jr.	Egg
Croagunk	Egg

X and Y: 25 species

Species	Method	Level
Timburr	Level up	20
Gurdurr	Level up	20
Conkeldurr	Level up	20
Clefairy	Level up	22
Froslass	Level up	28
Alomomola	Level up	29
Minccino	Level up	31
Skitty	Level up	32
Jynx	Level up	33
Makuhita	Level up, Egg	34
Poliwag	Level up	35
Machop	Level up	37
Machoke	Level up	40
Machamp	Level up	40
Jigglypuff	Level up	41
Hariyama	Level up	42
Poliwhirl	Level up	43
Miltank	Level up	50
Meloetta	Level up	50
Mr. Mime	Egg
Smoochum	Egg
Shroomish	Egg
Glameow	Egg
Mime Jr.	Egg
Croagunk	Egg

Black 2 and White 2: 25 species

Species	Method	Level
Timburr	Level up	20
Gurdurr	Level up	20
Conkeldurr	Level up	20
Clefairy	Level up	22
Froslass	Level up	28
Alomomola	Level up	29
Minccino	Level up	31
Skitty	Level up	32
Jynx	Level up	33
Makuhita	Level up, Egg	34
Poliwag	Level up	35
Machop	Level up	37
Machoke	Level up	40
Machamp	Level up	40
Jigglypuff	Level up	41
Hariyama	Level up	42
Poliwhirl	Level up	43
Meloetta	Level up	50
Miltank	Level up	55
Mr. Mime	Egg
Smoochum	Egg
Shroomish	Egg
Glameow	Egg
Mime Jr.	Egg
Croagunk	Egg

Black and White: 25 species

Species	Method	Level
Timburr	Level up	20
Gurdurr	Level up	20
Conkeldurr	Level up	20
Clefairy	Level up	22
Froslass	Level up	28
Alomomola	Level up	29
Minccino	Level up	31
Skitty	Level up	32
Jynx	Level up	33
Makuhita	Level up, Egg	34
Poliwag	Level up	35
Machop	Level up	37
Machoke	Level up	40
Machamp	Level up	40
Jigglypuff	Level up	41
Hariyama	Level up	42
Poliwhirl	Level up	43
Meloetta	Level up	50
Miltank	Level up	55
Mr. Mime	Egg
Smoochum	Egg
Shroomish	Egg
Glameow	Egg
Mime Jr.	Egg
Croagunk	Egg

HeartGold and SoulSilver: 17 species

Species	Method	Level
Clefairy	Level up	22
Jynx	Level up	28
Froslass	Level up	28
Skitty	Level up	32
Machop	Level up	34
Makuhita	Level up, Egg	34
Poliwag	Level up	35
Machoke	Level up	36
Machamp	Level up	36
Jigglypuff	Level up	37
Hariyama	Level up	42
Poliwhirl	Level up	43
Miltank	Level up	55
Mr. Mime	Egg
Shroomish	Egg
Mime Jr.	Egg
Croagunk	Egg

Platinum: 17 species

Species	Method	Level
Clefairy	Level up	22
Jynx	Level up	28
Froslass	Level up	28
Skitty	Level up	32
Machop	Level up	34
Makuhita	Level up, Egg	34
Poliwag	Level up	35
Machoke	Level up	36
Machamp	Level up	36
Jigglypuff	Level up	37
Hariyama	Level up	42
Poliwhirl	Level up	43
Miltank	Level up	55
Mr. Mime	Egg
Shroomish	Egg
Mime Jr.	Egg
Croagunk	Egg

Changed over time

One change since Generation IV

1. Through Gen VPower 6070 from X and Y, Generation VI