Babys: When a baby Pinata is about to grow up they will form a cacoon and it will expand making them an adult.

Sours: Sour Pinata form two cacoons, one when evolving to their sweet species and the other when growing up.

You can keep a Pinata a baby forever, to do this you need to hit the cacoon straight away with the trick stick, this helps meet the Sarsgorilla visit requirements