Said to have manifested itself when, once upon a time, a group of four children tried to identify a most peculiar food item and mistook it as a Jelly filled Doughnut.
It has since been wandering, trying to find it's country of origin with only a piece of raw fish in it's hand.

It's poke'dex entry would sound something like that l imagine.
This abomination was created by myself and Blastnova on DA, she came up with a concept to make some 10th gen pokemon parody comic, and this is our legendary.