Shiny Impidimp hatches in 185 Eggs [SQUARES]

Sorry for the phone quality, for whatever reason my Switch is refusing to let me post this to Twitter or Facebook. Go figure.
So evidently, according to some datamining, Pokemon with the Square shiny animation have a 1/16 chance of appearing when hatching from an egg. When stacking the shiny odds on top of that, the chance of hatching a square shiny from an egg is over 1/60000.
I didn't anticipate hatching such a rare dude! He's now fully evolved into a Grimmsnarl.