Off the top of my head

Coastal: Bulbasaur, Chikorita, Froakie, Popplio, Grookey

Savanna: Charmander, Totodile, Snivy, Fennekin, Rowlet, Sobble

Polar: Cyndaquil, Torchic, Chimchar, Piplup, Oshawott, Scorbunny

Canyon: Squirtle, Treecko, Turtwig, Tepig, Chespin, Litten

For Paldea, choose Fuecoco and you can get Sprigatito and Quaxly via a code.