Question: are there gyms in pokemon ultra sun?
Answer: Pokémon Gyms are not a thing in Alola. However, in Ultra Sun & Ultra Moon, one gym has opened up in Malie City. This Gym can be battled once a day and is an example of Kanto in Alola. While being based on Vermilion City Gym's layout, there is no puzzle here, just defeat all the trainers and then defeat the Leader.