Rock Blast is learned by 29 species by level, 112 by machine and 8 by egg

Effect, in PokéAPI's words

“Hits 2-5 times in one turn.”

Who learns it

112 species in all, 8 of 17 games shown

Scarlet and Violet: 63 species

Species	Method	Level
Trumbeak	Level up, Machine	1
Toucannon	Level up, Machine	1
Garganacl	Level up, Machine	1
Klawf	Level up, Machine	24
Nosepass	Level up, Machine	28
Probopass	Level up, Machine	28
Geodude	Level up, Machine	30
Rhyhorn	Level up, Machine	30
Rhydon	Level up, Machine	30
Rhyperior	Level up, Machine	30
Graveler	Level up, Machine	34
Golem	Level up, Machine	34
Rolycoly	Level up, Machine	40
Necrozma	Level up, Machine	48
Carkol	Level up, Machine	48
Coalossal	Level up, Machine	54
Diglett	Machine
Dugtrio	Machine
Shellder	Machine
Cloyster	Machine
Mew	Machine
Sudowoodo	Machine
Pineco	Machine
Forretress	Machine
Heracross	Machine
Slugma	Machine
Magcargo	Machine
Larvitar	Machine
Pupitar	Machine
Tyranitar	Machine
Regirock	Machine
Groudon	Machine
Torterra	Machine
Cranidos	Machine
Rampardos	Machine
Shieldon	Machine
Bastiodon	Machine
Gastrodon	Machine
Bronzor	Machine
Bronzong	Machine
Bonsly	Machine
Mamoswine	Machine
Heatran	Machine
Excadrill	Machine
Conkeldurr	Machine
Cinccino	Machine, Egg
Terrakion	Machine
Carbink	Machine
Lycanroc	Machine
Minior	Machine
Drednaw	Machine
Silicobra	Machine
Sandaconda	Machine
Stonjourner	Machine
Cufant	Machine
Copperajah	Machine
Kleavor	Machine
Bombirdier	Machine
Orthworm	Machine
Glimmet	Machine
Glimmora	Machine
Iron Thorns	Machine
Iron Boulder	Machine

Brilliant Diamond and Shining Pearl: 19 species

Species	Method	Level
Octillery	Level up	1
Nosepass	Level up	28
Probopass	Level up	28
Geodude	Level up	30
Rhyhorn	Level up	30
Rhydon	Level up	30
Rhyperior	Level up	30
Graveler	Level up	34
Golem	Level up	34
Anorith	Level up	36
Armaldo	Level up	36
Omanyte	Level up	45
Omastar	Level up	49
Shellder	Egg
Onix	Egg
Shuckle	Egg
Heracross	Egg
Remoraid	Egg
Shieldon	Egg

Sword and Shield: 74 species

Species	Method	Level
Octillery	Level up, Machine	1
Cinccino	Level up, Machine	1
Rhyhorn	Level up, Machine	30
Rhydon	Level up, Machine	30
Rhyperior	Level up, Machine	30
Roggenrola	Level up, Machine	32
Dwebble	Level up, Machine	32
Crustle	Level up, Machine	32
Anorith	Level up, Machine	36
Armaldo	Level up, Machine	36
Boldore	Level up, Machine	36
Gigalith	Level up, Machine	36
Stakataka	Level up, Machine	40
Rolycoly	Level up, Machine	40
Omanyte	Level up, Machine	45
Necrozma	Level up, Machine	48
Carkol	Level up, Machine	48
Omastar	Level up, Machine	49
Coalossal	Level up, Machine	54
Nidoqueen	Machine
Nidoking	Machine
Machamp	Machine
Shellder	Machine
Cloyster	Machine
Onix	Machine
Kabuto	Machine
Kabutops	Machine
Aerodactyl	Machine
Mew	Machine
Sudowoodo	Machine
Steelix	Machine
Shuckle	Machine
Heracross	Machine
Corsola	Machine
Remoraid	Machine
Mantine	Machine
Tyranitar	Machine
Lairon	Machine
Aggron	Machine
Lunatone	Machine
Solrock	Machine
Lileep	Machine
Cradily	Machine
Relicanth	Machine
Regirock	Machine
Mamoswine	Machine
Excadrill	Machine
Conkeldurr	Machine
Tirtouga	Machine
Carracosta	Machine
Archen	Machine
Archeops	Machine
Trubbish	Machine
Garbodor	Machine
Terrakion	Machine
Binacle	Machine
Barbaracle	Machine
Tyrunt	Machine
Tyrantrum	Machine
Amaura	Machine
Aurorus	Machine
Lycanroc	Machine
Blacephalon	Machine
Drednaw	Machine
Sandaconda	Machine
Cursola	Machine
Runerigus	Machine
Stonjourner	Machine
Cufant	Machine
Copperajah	Machine
Dracozolt	Machine
Arctozolt	Machine
Dracovish	Machine
Arctovish	Machine

Ultra Sun and Ultra Moon: 31 species

Species	Method	Level
Octillery	Level up	1
Crustle	Level up	1, 5
Cinccino	Level up	1
Trumbeak	Level up	1
Toucannon	Level up	1
Dwebble	Level up	5
Roggenrola	Level up	14
Boldore	Level up	14
Gigalith	Level up	14
Necrozma	Level up	19
Nosepass	Level up	28
Probopass	Level up	28
Rhyhorn	Level up	29
Rhydon	Level up	29
Rhyperior	Level up	29
Geodude	Level up	30
Corsola	Level up	31
Graveler	Level up	34
Golem	Level up	34
Omanyte	Level up	46
Stakataka	Level up	47
Anorith	Level up	55
Omastar	Level up	56
Armaldo	Level up	61
Shellder	Egg
Onix	Egg
Shuckle	Egg
Heracross	Egg
Remoraid	Egg
Shieldon	Egg
Trubbish	Egg

Sun and Moon: 30 species

Species	Method	Level
Octillery	Level up	1
Crustle	Level up	1, 5
Cinccino	Level up	1
Trumbeak	Level up	1
Toucannon	Level up	1
Dwebble	Level up	5
Roggenrola	Level up	14
Boldore	Level up	14
Gigalith	Level up	14
Necrozma	Level up	19
Nosepass	Level up	28
Probopass	Level up	28
Rhyhorn	Level up	29
Rhydon	Level up	29
Rhyperior	Level up	29
Geodude	Level up	30
Corsola	Level up	31
Graveler	Level up	34
Golem	Level up	34
Omanyte	Level up	46
Anorith	Level up	55
Omastar	Level up	56
Armaldo	Level up	61
Shellder	Egg
Onix	Egg
Shuckle	Egg
Heracross	Egg
Remoraid	Egg
Shieldon	Egg
Trubbish	Egg

Omega Ruby and Alpha Sapphire: 27 species

Species	Method	Level
Octillery	Level up	1
Crustle	Level up	1, 5
Cinccino	Level up	1
Dwebble	Level up	5
Roggenrola	Level up	14
Boldore	Level up	14
Gigalith	Level up	14
Nosepass	Level up	28
Probopass	Level up	28
Rhyhorn	Level up	29
Rhydon	Level up	29
Rhyperior	Level up	29
Geodude	Level up	30
Corsola	Level up	31
Graveler	Level up	34
Golem	Level up	34
Omanyte	Level up	46
Anorith	Level up	55
Omastar	Level up	56
Armaldo	Level up	61
Shellder	Egg
Onix	Egg
Shuckle	Egg
Heracross	Egg
Remoraid	Egg
Shieldon	Egg
Trubbish	Egg

X and Y: 27 species

Species	Method	Level
Octillery	Level up	1
Crustle	Level up	1, 5
Cinccino	Level up	1
Dwebble	Level up	5
Roggenrola	Level up	14
Boldore	Level up	14
Gigalith	Level up	14
Nosepass	Level up	18
Probopass	Level up	18
Geodude	Level up	22
Graveler	Level up	22
Golem	Level up	22
Rhyhorn	Level up	23
Rhydon	Level up	23
Rhyperior	Level up	23
Corsola	Level up	31
Omanyte	Level up	46
Anorith	Level up	49
Armaldo	Level up	55
Omastar	Level up	56
Shellder	Egg
Onix	Egg
Shuckle	Egg
Heracross	Egg
Remoraid	Egg
Shieldon	Egg
Trubbish	Egg

Black 2 and White 2: 26 species

Species	Method	Level
Octillery	Level up	1
Crustle	Level up	1, 5
Cinccino	Level up	1
Dwebble	Level up	5
Roggenrola	Level up	14
Boldore	Level up	14
Gigalith	Level up	14
Nosepass	Level up	18
Probopass	Level up	18
Geodude	Level up	22
Graveler	Level up	22
Golem	Level up	22
Rhyhorn	Level up	23
Rhydon	Level up	23
Rhyperior	Level up	23
Corsola	Level up	31
Omanyte	Level up	46
Anorith	Level up	49
Armaldo	Level up	55
Omastar	Level up	56
Shellder	Egg
Onix	Egg
Shuckle	Egg
Remoraid	Egg
Shieldon	Egg
Trubbish	Egg

Changed over time

One change since Generation III

1. Through Gen IVAccuracy 80%90% from Black and White, Generation V