Penguin

The Penguin is a limited Mythical from the Christmas Harvest Event, and its sourcing is the whole story: it comes out of Santa's Stash, an event-gated reward rather than a standard egg you can farm at will. That means obtainability is the real barrier here. Once the event closes, the Penguin becomes a fixed-supply collectible whose value drifts toward trading scarcity rather than something a new player can simply grind for.

Because the row does not list a passive ability or hunger value, resist any temptation to rank it on output. The defensible read is purely structural: a limited Mythical tied to a seasonal stash tends to hold prestige and trade weight precisely because the door to acquiring it is shut for most of the year.

For a serious farming build, the Penguin is a situational pick. If you grabbed it during the Christmas window, keep it as a rarity anchor or trade asset; if you are assembling a yield-focused lineup today and don't own one, your effort is better spent on documented egg pets with a known economy or growth passive. The Penguin earns its slot on scarcity and seasonal flex, not on confirmed numbers.