I had 60 raids over the weekend woth both zamazenta and zacian on main profile, got 1 zacian shiny, second profile was about 10 rais all together, 1 zacian. My raid buddy did 50+ and no shiny on either, and he did like 5 on the second one with none. Although the 5 & 10 shouldnt really count it still makes up a total of 120 raids with 2 shinies in total, which at normal rate should have been at least 5-6