Unfortunately, the Dark Link armor set will not appear in Kilton’s stock until players have beaten all four of Hyrule’s Divine Beasts. His inventory will be relatively sparse to begin with, but progressing the main story will unlock additional products to get for Mon. He’ll sell a variety of strange weapons, items, armor sets and costumes that can only be purchased using Mon, a proprietary currency players can convert monster parts into by speaking to Kilton.
Once players have finished the related quest and spoken to him for the first time, Kilton and his floating shop will begin appearing on the outskirts of towns and villages at nighttime.