I wanted Shadow Blue for my chocobo. On my first few attempts I landed on plum purple and regal purple. Next feeding I got Royal Blue then while trying to darken the blue I landed on Abyssal Blue. So I decided to feed it one pineapple to lighten the blue shade rather than darken and got my Shadow Blue. So I would say the shadow blue should be charted somewhere between the Royal Blue, Abyssal Blue, and Regal Purple. Maybe even above the Gloom Purple, though I never landed on that specific shade while trying for my Shadow Blue.