The Pink Egg was an exclusive egg in Adopt Me that was only obtainable by trading or at the very start of the Pet Update. You would receive a pink egg after telling Sir Woofington to build a pet department in the Nursery. It cost 100 bucks to time travel and go back in time to when they were building the Nursery. After you did that, Tom would give you a Pink Egg. The Pink Egg could only hatch into an Uncommon Pink Cat.