Quote Originally Posted by Noblejanobii View Post
Probably because most people don't own or don't want a Switch.

Though it is worth noting this from serebii "It is currently noted that The Pokémon Company International's press site is listing Ultra Sun & Ultra Moon as being on the Nintendo Switch with a "To Be Announced""
Well that's some backwards logic, don't you think? Pokemon is literally the Nintendo system seller. Nobody wanted a 3DS for the first year or so. Then the price dropped, Pokemon X and Y happened, and suddenly everyone had a 3DS now.