Needed

Ekans & Arbok

non-Alolan Raichu

Normal Sandslash

Alolan Sandshrew & Sandslash

Nidoran♀ & Nidorina & Nidoqueen

Nidoran♂ & Nidorino & Nidoking

Clefable

non-Alolan Ninetails

female Golbat

http://www.serebii.net/pokedex-sm/046.shtml