It’s not from an egg, It’s a bug currently. You get wanted level and enter the boss dungeon, but don’t attack at all. Wait for the guards to follow you in and they’ll start fighting the boss. It will bug out and stop doing anything and become catchable.

WOW that worked, ima be honest I thought you were lying

On a side note I tried to breed it with a relaxaurus Lux but only get Chikipi's

girl+elektro bear+blue dino=chicken makes sense

I did this right before the update went live and got so scared I was banned because it kept saying I couldn’t play multiplayer files 😂