The Crystal Hippogriff is a Legendary pet in Bubble Gum Simulator. It can be obtained by opening a Sparkly Egg. The chance of hatching it is 0.005% (1 in 20,000), or 0.01% (1 in 10,000) with the Lucky Chancesgamepass.
It could also have been obtained in the Season 2 Bubble Pass Premium Rewards upon reaching 1,300 points.
This pet currently wears its hats too low, and many of them can't be seen due to being hidden in its body.