The Huge Gargoyle Dragon is an EXCLUSIVE pet that was available from the Exclusive Pets Egg, with a 2% chance of hatching. It was released in the Axolotl Update. This is actually the Huge version of the Gargoyle Dragon pet.
The latest Pet Simulator X value list for Huge Gargoyle Dragon can be found below:
💎 350,000,000,000 (350b)
💎 740,000,000,000 (740b)
💎 1,000,000,000,000 (1t)
💎 Not Available