Cubone evolves into:
Alolan Marowak, Nighttime
So can Cubone evolve into regular Marowak at Daytime in Alola?
No, a Cubone that evolves in Alola will only ever evolve into Alolan Marowak. But it can only evolve at night, similar to Umbreon. If Cubone reaches level 28 in the daytime it just won't evolve.
I hope I helped :)