Huge Dragon
The Huge Dragon is an EXCLUSIVE pet that was only obtainable from buying the Dragon Plush toy from the official Big Games Shop website. It was available for a limited time in March of 2022.
The latest Pet Simulator X value list for Huge Dragon can be found below:

Regular
💎 1,000,000,000,000 (1t)

Golden
💎 Not Available

Rainbow
💎 Not Available

Dark Matter
💎 Not Available