Pterodactyl

The Pterodactyl is a mythical that once came from the Dinosaur Egg or the DNA Converter, and the most important fact about it today is that both routes are closed. The Dinosaur Egg, the Pterodactyl, and the rest of that egg's lineup can no longer be pulled from the DNA Converter, which moves this pet out of the "go hatch one" category and into the fully retired, trade-only tier.

That unobtainability is exactly what makes it matter on a serious team. Retired mythicals don't get diluted by new supply, so a leveled Pterodactyl is both a flex companion and a genuine asset, the kind of pet whose scarcity does as much for your account's prestige and trade leverage as any passive would. Anyone showing one off effectively owns a piece of the game's history.

If you already have a Pterodactyl, the play is simple: hold it, level it, and don't trade it away cheaply, because there's no faucet to print more. If you don't, treat it as a market target rather than a farm goal, and budget accordingly, since the only path left is buying it from a player who pulled one while the dinosaur content was still live.