The Ghost Cat is a BASIC pet that was available from the Eerie Egg during the Halloween Event 2021. This pet had a 61% base chance of hatching.
The latest Pet Simulator X value list for Ghost Cat can be found below:
💎 17,000 (17k)
💎 49,000 (49k)
💎 151,000 (151k)
💎 473,000 (473k)