I thought that was a breeding coloration. I did catch an shiny Aky Pup and Owprin Chick over the week. I, also, unfortunately turned in the latter while cleaning out my Kogo. It was a nice red color, too.
If you dont wanna turn in by mistake (i have done so also with a starred up constella T_T) put a card on it - it wont let you turn it in once it has a card on it.