Scraf

Hi all, I'm trying to complete a living dex for my Ultra Sun and I can get most of the Pokemon on my own/through the game's GTS. However, there are a couple I need help with: Need: Zeraora, Marshadow Need to trade back and forth: Porygon -> Porygon2, Porygon2 -> PorygonZ, Slowbro -> Slowking I can offer a master ball, a golden bottle cap, and most legendary Pokemon for them. Here is a screenshot of my progress so far. Thanks in advance!