Poryhedron's Monotype Challenges
Winner of the 2007 Pokéhelper Unown Award! Glad I could be of help!
Pokémon GO: Level 37, Team Mystic
Really I am just going off the Bulbapedia article, and pretty much the name that people at Serebii believe it is. The only reason I can think of it being Dusk Gold, is that unlike Dawn, the sun and sky is a bit more golden at dusk. Then again it just seems like it is all a jack ass way to fit in DS into the title.