Earlier this year, Shiny Rockruff was one of the featured Pokemon in Pokemon GO's Lustrous Odyssey event, along with Midday Lycanroc and Midnight Lycanroc. In the comments under AnnushkaToys ...

There's a clear theme to the shinies of Rockruff's evolutionary line ... has three different forms of its evolution Lycanroc: Midday, Midnight, and Dusk, depending on what time of day it evolves.