The Huge Party Cat is an EXCLUSIVE pet that could be obtained from the free Anniversary Gift with a 0.1% chance. The Anniversary Gift was given to all Pet Sim X players above the Pro rank during the Hardcore Anniversary Update of July 2022. It is the Huge version of the Party Cat pet.
The latest Pet Simulator X value list for Huge Party Cat can be found below:
💎 2,000,000,000,000 (2t)
💎 8,000,000,000,000 (8t)
💎 20,000,000,000,000 (20t)
💎 Not Available