Huge Cat
The Huge Cat is an EXCLUSIVE pet that was only obtainable from buying the Cat Plush toy from the official Big Games Shop website. There was a 1% chance of obtaining a Rainbow version of the Huge Cat instead of the Regular one.
The latest Pet Simulator X value list for Huge Cat can be found below:

Regular
💎 983,000,000,000 (983b)

Golden
💎 Not Available

Rainbow
💎 2,500,000,000,000 (2.5t)

Dark Matter
💎 Not Available