Hiya, I'm sorry to say but Hoopa, Keldio and Zygarde are not obtainable in shiny form as of yet, Volcanion isn't available at all let alone as a shiny and all shiny Mews are considered hacks on this site, plus Yveltal and Xerneas are only legit if it's from the 'XY&Z' event. I can offer you a shiny Treeko if you can give me all the information for the non shiny Keldio, which event is it from, IV, OT, Trainer ID, nature, level, move set ect.