In Video Games
Hoshi de Hakken!! Tamagotchi
Adult PiT evolves from Child PiT after two days and evolves into Gold PiT after six days. While Adult PiT is an adult and functions as such (i.e. being able to be taken outside), the PiT line lacks a child stage and Adult PiT will always evolve into Gold PiT.
Adult PiT is genderless and cannot breed.