Terrain Pulse is learned by 3 species by level and 22 by tutor

Effect, in PokéAPI's words

“If any terrain is active and the user is grounded, this moves power is doubled and changes type to match that terrains type.”

Who learns it

25 species in all, 2 games

Scarlet and Violet: 3 species

Species	Method	Level
Smoliv	Level up	38
Dolliv	Level up	42
Arboliva	Level up	46

Sword and Shield: 22 species

Species	Method	Level
Venusaur	Tutor
Blastoise	Tutor
Exeggutor	Tutor
Lickitung	Tutor
Kangaskhan	Tutor
Snorlax	Tutor
Mew	Tutor
Dunsparce	Tutor
Exploud	Tutor
Lucario	Tutor
Lickilicky	Tutor
Regigigas	Tutor
Clauncher	Tutor
Clawitzer	Tutor
Carbink	Tutor
Xerneas	Tutor
Diancie	Tutor
Oranguru	Tutor
Palossand	Tutor
Type: Null	Tutor
Silvally	Tutor
Indeedee	Tutor