Bullet Seed is learned by 32 species by level, 133 by machine and 11 by egg

Effect, in PokéAPI's words

“Hits 2-5 times in one turn.”

Who learns it

135 species in all, 8 of 17 games shown

Scarlet and Violet: 109 species

Species	Method	Level
Exeggutor	Level up, Machine	1
Cinccino	Level up, Machine	1
Hoppip	Level up, Machine	12
Bramblin	Level up, Machine	13
Brambleghast	Level up, Machine	13
Skiploom	Level up, Machine	15
Jumpluff	Level up, Machine	15
Cacnea	Level up, Machine	16
Cacturne	Level up, Machine	16
Deerling	Level up, Machine	16
Sawsbuck	Level up, Machine	16
Tandemaus	Level up, Machine	18
Maushold	Level up, Machine	18
Appletun	Level up, Machine	20
Dipplin	Level up, Machine	20
Hydrapple	Level up, Machine	20
Capsakid	Level up, Machine	21
Scovillain	Level up, Machine	21
Sunflora	Level up, Machine	25
Exeggcute	Level up, Machine	30
Pikipek	Level up, Machine	31
Skwovet	Level up, Machine	35
Trumbeak	Level up, Machine	37
Toucannon	Level up, Machine	40
Greedent	Level up, Machine	41
Morpeko	Level up, Machine	45
Bulbasaur	Machine
Ivysaur	Machine
Venusaur	Machine
Oddish	Machine
Gloom	Machine
Vileplume	Machine
Bellsprout	Machine
Weepinbell	Machine
Victreebel	Machine
Mew	Machine
Chikorita	Machine
Bayleef	Machine
Meganium	Machine
Bellossom	Machine
Sunkern	Machine
Heracross	Machine
Treecko	Machine
Grovyle	Machine
Sceptile	Machine
Lotad	Machine
Lombre	Machine
Ludicolo	Machine
Seedot	Machine
Nuzleaf	Machine
Shiftry	Machine
Shroomish	Machine
Breloom	Machine
Gulpin	Machine
Swalot	Machine
Tropius	Machine
Turtwig	Machine
Grotle	Machine
Torterra	Machine
Snover	Machine
Abomasnow	Machine
Leafeon	Machine
Shaymin	Machine
Arceus	Machine
Snivy	Machine
Servine	Machine
Serperior	Machine
Leavanny	Machine
Petilil	Machine
Lilligant	Machine
Minccino	Machine
Foongus	Machine
Amoonguss	Machine
Virizion	Machine
Chespin	Machine
Quilladin	Machine
Chesnaught	Machine
Skiddo	Machine
Gogoat	Machine
Rowlet	Machine
Dartrix	Machine
Decidueye	Machine
Fomantis	Machine
Lurantis	Machine
Bounsweet	Machine
Steenee	Machine
Tsareena	Machine
Comfey	Machine
Grookey	Machine
Thwackey	Machine
Rillaboom	Machine
Flapple	Machine
Zarude	Machine
Calyrex	Machine
Sprigatito	Machine
Floragato	Machine
Meowscarada	Machine
Lechonk	Machine
Oinkologne	Machine
Tarountula	Machine
Spidops	Machine
Smoliv	Machine
Dolliv	Machine
Arboliva	Machine
Toedscool	Machine
Toedscruel	Machine
Brute Bonnet	Machine
Wo-Chien	Machine
Ogerpon	Machine

Brilliant Diamond and Shining Pearl: 60 species

Species	Method	Level
Exeggutor	Level up, Machine	1
Mantine	Level up, Machine	1
Hoppip	Level up, Machine	19
Skiploom	Level up, Machine	20
Jumpluff	Level up, Machine	20
Sunflora	Level up, Machine	25
Remoraid	Level up, Machine	28
Exeggcute	Level up, Machine	30
Octillery	Level up, Machine	30
Bulbasaur	Machine
Ivysaur	Machine
Venusaur	Machine
Oddish	Machine
Gloom	Machine
Vileplume	Machine
Paras	Machine
Parasect	Machine
Bellsprout	Machine
Weepinbell	Machine
Victreebel	Machine
Tangela	Machine
Mew	Machine
Chikorita	Machine
Bayleef	Machine
Meganium	Machine
Bellossom	Machine
Sunkern	Machine
Heracross	Machine
Treecko	Machine
Grovyle	Machine
Sceptile	Machine
Lotad	Machine
Lombre	Machine
Ludicolo	Machine
Seedot	Machine
Nuzleaf	Machine
Shiftry	Machine
Shroomish	Machine
Breloom	Machine
Roselia	Machine
Gulpin	Machine
Swalot	Machine
Cacnea	Machine
Cacturne	Machine
Lileep	Machine
Cradily	Machine
Tropius	Machine
Turtwig	Machine
Grotle	Machine
Torterra	Machine
Budew	Machine
Roserade	Machine
Wormadam	Machine
Cherubi	Machine
Cherrim	Machine
Carnivine	Machine
Snover	Machine
Abomasnow	Machine
Tangrowth	Machine
Leafeon	Machine

Sword and Shield: 55 species

Species	Method	Level
Exeggutor	Level up, Machine	1
Mantine	Level up, Machine	1
Cinccino	Level up, Machine	1
Pumpkaboo	Level up, Machine	20
Gourgeist	Level up, Machine	20
Appletun	Level up, Machine	20
Remoraid	Level up, Machine	28
Exeggcute	Level up, Machine	30
Octillery	Level up, Machine	30
Skwovet	Level up, Machine	35
Greedent	Level up, Machine	41
Morpeko	Level up, Machine	45
Bulbasaur	Machine
Ivysaur	Machine
Venusaur	Machine
Oddish	Machine
Gloom	Machine
Vileplume	Machine
Tangela	Machine
Mew	Machine
Bellossom	Machine
Heracross	Machine
Treecko	Machine
Grovyle	Machine
Sceptile	Machine
Lotad	Machine
Lombre	Machine
Ludicolo	Machine
Seedot	Machine
Nuzleaf	Machine
Shiftry	Machine
Roselia	Machine
Lileep	Machine
Cradily	Machine
Budew	Machine
Roserade	Machine
Cherubi	Machine
Cherrim	Machine
Snover	Machine
Abomasnow	Machine
Tangrowth	Machine
Leafeon	Machine
Maractus	Machine
Ferroseed	Machine
Ferrothorn	Machine
Fomantis	Machine
Lurantis	Machine
Comfey	Machine
Tapu Bulu	Machine
Rillaboom	Machine
Gossifleur	Machine
Eldegoss	Machine
Flapple	Machine
Zarude	Machine
Calyrex	Machine

Ultra Sun and Ultra Moon: 26 species

Species	Method	Level
Heracross	Level up	1
Mantine	Level up	1
Cinccino	Level up	1
Exeggcute	Level up	17
Hoppip	Level up	19
Skiploom	Level up	20
Jumpluff	Level up	20
Sunflora	Level up	25
Pumpkaboo	Level up	26
Gourgeist	Level up	26
Pikipek	Level up	31
Trumbeak	Level up	37
Remoraid	Level up	38
Toucannon	Level up	40
Octillery	Level up	46
Bellsprout	Egg
Treecko	Egg
Seedot	Egg
Shroomish	Egg
Roselia	Egg
Tropius	Egg
Snover	Egg
Patrat	Egg
Pansage	Egg
Maractus	Egg
Ferroseed	Egg

Sun and Moon: 25 species

Species	Method	Level
Heracross	Level up	1
Mantine	Level up	1
Cinccino	Level up	1
Exeggcute	Level up	17
Hoppip	Level up	19
Skiploom	Level up	20
Jumpluff	Level up	20
Sunflora	Level up	25
Pumpkaboo	Level up	26
Gourgeist	Level up	26
Pikipek	Level up	31
Trumbeak	Level up	37
Remoraid	Level up	38
Toucannon	Level up	40
Octillery	Level up	46
Bellsprout	Egg
Treecko	Egg
Seedot	Egg
Shroomish	Egg
Roselia	Egg
Tropius	Egg
Snover	Egg
Pansage	Egg
Maractus	Egg
Ferroseed	Egg

Omega Ruby and Alpha Sapphire: 22 species

Species	Method	Level
Heracross	Level up	1
Mantine	Level up	1
Cinccino	Level up	1
Exeggcute	Level up	17
Hoppip	Level up	19
Skiploom	Level up	20
Jumpluff	Level up	20
Sunflora	Level up	25
Pumpkaboo	Level up	26
Gourgeist	Level up	26
Remoraid	Level up	38
Octillery	Level up	46
Bellsprout	Egg
Treecko	Egg
Seedot	Egg
Shroomish	Egg
Roselia	Egg
Tropius	Egg
Snover	Egg
Pansage	Egg
Maractus	Egg
Ferroseed	Egg

X and Y: 22 species

Species	Method	Level
Heracross	Level up	1
Mantine	Level up	1
Cinccino	Level up	1
Exeggcute	Level up	17
Hoppip	Level up	19
Skiploom	Level up	20
Jumpluff	Level up	20
Sunflora	Level up	25
Pumpkaboo	Level up	26
Gourgeist	Level up	26
Remoraid	Level up	38
Octillery	Level up	46
Bellsprout	Egg
Treecko	Egg
Seedot	Egg
Shroomish	Egg
Roselia	Egg
Tropius	Egg
Snover	Egg
Pansage	Egg
Maractus	Egg
Ferroseed	Egg

Black 2 and White 2: 18 species

Species	Method	Level
Mantine	Level up	1
Cinccino	Level up	1
Exeggcute	Level up	17
Hoppip	Level up	19
Skiploom	Level up	20
Jumpluff	Level up	20
Sunflora	Level up	25
Remoraid	Level up	38
Octillery	Level up	46
Bellsprout	Egg
Treecko	Egg
Seedot	Egg
Shroomish	Egg
Tropius	Egg
Snover	Egg
Pansage	Egg
Maractus	Egg
Ferroseed	Egg

Changed over time

One change since Generation III

1. Through Gen IVPower 1025 from Black and White, Generation V