The M-2 Prototype is a MYTHICAL pet that is obtainable from the Dark Tech Egg with a ~0.00065% base chance of hatching. This pet is often confused with the M-6 Prototype which looks exactly the same except for the difference in color.
The latest Pet Simulator X value list for M-2 Prototype can be found below:
💎 52,000,000 (52m)
💎 151,000,000 (151m)
💎 247,000,000 (247m)
💎 383,000,000 (383m)