Smoliv Shiny Hunting Guide (Pokémon Scarlet & Violet)
Location
The orchards around Cortondo are a great place to isolate this encounter. Use a grass type encounter & sparkling power sandwich, and you'll see tons of Smolivs.
Evolution
Smoliv evolves into 
Dolliv at level 25, and 
Arboliva at level 35.
Arboliva has cool, new signature ability called Seed Sower which automatically triggers 
Grassy Terrain whenever it takes damage, boosting the power of Grass-type moves.