Ankylosaurus

The Ankylosaurus is a limited mythical pet that only became obtainable during the Prehistoric Event, which is the single most important thing to know about it. Because it is event-locked and limited, there is no permanent egg or shop you can grind for it — once the event window closed, the only way to own one is to have hatched it in time or to trade for it now.

That scarcity is exactly what drives its value. Limited mythicals from past events tend to climb in the trading economy precisely because the supply is fixed and shrinking, so an Ankylosaurus today is more of a collector and trade asset than something you "farm." If you missed the Prehistoric Event, expect to pay a premium in trades, and weigh that against pets you can still pull freely.

The honest take: there is no cost-versus-pool math here because it was never sold from a standard egg with published odds. The Ankylosaurus is a time-capsule pet — its appeal is rarity and the dinosaur theme, not raw efficiency. Chase it only if you value owning a closed-event mythical, and treat any trade offer as the real "price" of admission.