The A-36 is a MYTHICAL pet that can be hatched from the Titanium Egg, with a ~0.0003% base chance of hatching. It has also been sold by the Traveling Merchant from time to time. This pet is one of the hardest pets to hatch.
The latest Pet Simulator X value list for A-36 can be found below:
💎 65,000,000 (65m)
💎 223,000,000 (223m)
💎 512,000,000 (512m)
💎 878,000,000 (878m)