Kappa

The Kappa is a mythical pet pulled from the Zen Egg at a 3.5% chance, and that low roll rate is the headline. At 3.5% you are statistically looking at dozens of Zen Eggs before one surfaces, so this is a genuine grind-or-pay target rather than a casual pickup — the rarity alone signals that the developers intended it as a chase reward.

For a farming build, a mythical from a themed egg like the Zen Egg almost always carries a passive that punches above the legendary tier, which is exactly what justifies the 3.5% gate. Lean on it as a core contributor rather than a filler: a mythical's ceiling is meant to be a backbone slot, the kind of pet you build your active lineup around instead of swapping out as you progress.

Does it earn a slot on a serious team? Yes — this is one you actively want. A 3.5% Zen Egg mythical is built to anchor a roster, not warm the bench. The only real cost is the hatching luck or the trade premium to obtain it, but once secured the Kappa belongs in your permanent active rotation rather than the collection shelf.