6kgold.com offers Ultra Shiny Legendary - Dusk Mane Necrozma, Dawn Wings Necrozma, White Kyurem and Black Kyurem, choose the Legendary you want and make order, our team will send the pokemon to you asap, you will need to fuse it yourself.
Dusk Mane Necrozma (Fuse Necrozma & Solgaleo, use N-Solarizer)
Dawn Wings Necrozma (Fuse Necrozma & Lunala, use N-Lunarizer)
White Kyurem (Fuse Kyurem & Reshiram, use DNA Splicer)
Black Kyurem (Fuse Kyurem & Zekrom, use DNA Splicer)
After you get a Necrozma or Kyurem, please go to Stow-on-Side, you will get N-Solarizer / N-Lunarizer / DNA Splicer item from the bargain shop keeper, use the item, you can fuse those pokemon, shiny or non-shiny both are available.