Following a recent campaign over which Hiker is the best across all Pokémon generations, The Pokémon Company has shared a small clip displaying main Trainer in Pokémon Ultra Sun and Ultra Moon walking up Wela Volcano and encountering the Hiker at the top of the volcano, where you’d normally find Captain Kiawe. You can check out the brief clip in the following video:
Source: Serebii
Pokémon Blog 