Question: is tapu bulu shiny locked?
Answer: Sun & Moon, Ultra Sun & Ultra Moon: Zygarde, Tapu Koko, Tapu Lele, Tapu Bulu, Tapu Fini, Cosmog, Solgaleo, Lunala, Necrozma. Sun & Moon only: Nihilego, Buzzwole, Pheromosa, Xurkitree, Celesteela, Kartana, Guzzlord (these are not Shiny Locked in Ultra Sun & Ultra Moon)