Does anyone have a chart, list or video to show where all the "hidden enemies" are in the Wii U version?  I want to unlock the Dark Rodea costume, but information about them is almost nonexistent.

I've heard there are some in chapters 2, 4, 6, 7, 8, 12, 13, 16, 19 and 22, but I've only found the one in chapter 2 myself, and I have no details about the others.