Ok I will tryNah, your luck is probably not bad, I've gone 40 boxes before I found a shiny before, sometimes it takes 5, just keep trying.
Also, if you have a Japanese Ditto, make sure the other pokemon is from a different region.
For example, a Japanese Ditto and American/European whatever. It also works without the Japanese Ditto as long as one pokemon is from a different region.
But someone know some more hidden pokemon like hoopa has been seen? Or mega ?