Metal Burst is learned by 16 species by level and 7 by egg

Effect, in PokéAPI's words

“Strikes back at the last Pokémon to hit the user this turn with 1.5× the damage.”

Who learns it

23 species in all, 8 of 12 games shown

Scarlet and Violet: 17 species

Species	Method	Level
Bisharp	Level up	1
Perrserker	Level up	1
Kingambit	Level up	1
Cobalion	Level up	35
Shieldon	Level up	37
Bastiodon	Level up	43
Zamazenta	Level up	44
Solgaleo	Level up	49
Duraludon	Level up	60
Archaludon	Level up	60
Dialga	Level up	64
Iron Crown	Level up	84
Rhyhorn	Egg
Rhydon	Egg
Sableye	Egg
Rhyperior	Egg
Orthworm	Egg

Brilliant Diamond and Shining Pearl: 9 species

Species	Method	Level
Shieldon	Level up	37
Bastiodon	Level up	43
Aron	Level up	60
Dialga	Level up	72
Lairon	Level up	76
Aggron	Level up	88
Rhyhorn	Egg
Sableye	Egg
Mawile	Egg

Sword and Shield: 14 species

Species	Method	Level
Bisharp	Level up	1
Perrserker	Level up	1
Zamazenta	Level up	1
Cobalion	Level up	35
Solgaleo	Level up	49
Escavalier	Level up	52
Aron	Level up	60
Duraludon	Level up	60
Dialga	Level up	64
Lairon	Level up	76
Aggron	Level up	88
Rhyhorn	Egg
Sableye	Egg
Durant	Egg

Ultra Sun and Ultra Moon: 12 species

Species	Method	Level
Bisharp	Level up	1
Cobalion	Level up	1, 55
Dialga	Level up	24
Shieldon	Level up	37
Bastiodon	Level up	43
Solgaleo	Level up	43
Aron	Level up	49
Lairon	Level up	55
Aggron	Level up	63
Rhyhorn	Egg
Sableye	Egg
Mawile	Egg

Sun and Moon: 12 species

Species	Method	Level
Bisharp	Level up	1
Cobalion	Level up	1, 55
Dialga	Level up	24
Shieldon	Level up	37
Bastiodon	Level up	43
Solgaleo	Level up	43
Aron	Level up	49
Lairon	Level up	55
Aggron	Level up	63
Rhyhorn	Egg
Sableye	Egg
Mawile	Egg

Omega Ruby and Alpha Sapphire: 11 species

Species	Method	Level
Bisharp	Level up	1
Cobalion	Level up	1, 67
Dialga	Level up	24
Shieldon	Level up	37
Bastiodon	Level up	43
Aron	Level up	49
Lairon	Level up	55
Aggron	Level up	63
Rhyhorn	Egg
Sableye	Egg
Mawile	Egg

X and Y: 11 species

Species	Method	Level
Bisharp	Level up	1
Cobalion	Level up	1, 67
Dialga	Level up	24
Shieldon	Level up	37
Bastiodon	Level up	43
Aron	Level up	50
Lairon	Level up	62
Aggron	Level up	74
Rhyhorn	Egg
Sableye	Egg
Mawile	Egg

Black 2 and White 2: 10 species

Species	Method	Level
Bisharp	Level up	1
Dialga	Level up	24
Shieldon	Level up	37
Bastiodon	Level up	43
Aron	Level up	50
Lairon	Level up	62
Cobalion	Level up	67
Aggron	Level up	74
Sableye	Egg
Mawile	Egg