Dominus Alienus
The Dominus Alienus is a MYTHICAL pet available from the Chemical Egg, with a ~0.000001% base chance of hatching. The only regular βDominusβ pet stronger than the Dominus Alienus is the Dominus Darkwing.
The latest Pet Simulator X value list for Dominus Alienus can be found below:

Regular
π 49,000,000 (49m)

Golden
π 143,000,000 (143m)

Rainbow
π 218,000,000 (218m)

Dark Matter
π 330,000,000 (330m)