Is Sightseer Marcus the only trainer in Pokemon Sun and Moon with a shiny or are there others?

Question

In Seafolk Village there is a trainer with a shiny exeggcute. I was wondering if there were any other trainers with shinies in the game or if he was the only one.

Answer 1

Sightseer Marcus is the first NPC outside of a battle facility to use a Shiny Pokémon.

Source

So while technically theres the various Battle Facilities, he's the only in-game trainer in Sun/Moon, or ever, for that matter, to have a shiny Pokemon.

Hope I could help!