Lucky Cat
The Lucky Cat is an EXCLUSIVE pet that was available from the Exclusive Pets Egg, with a 13% chance of hatching. It was released in the Mastery Update for a limited time only.
The latest Pet Simulator X value list for Lucky Cat can be found below:

Regular
💎 8,000,000,000 (8b)

Golden
💎 Not Available

Rainbow
💎 Not Available

Dark Matter
💎 Not Available