If you were looking for the articles about the eggs that look similar, then see Jelly Egg or Colorful Egg.
The Rainbow Egg is an egg in Bubble Gum Simulator. It is located in The Void where it can be purchased for 650,000 Gems.
Pets
Common
Unique
Rare
Epic
Legendary
Pet Stats and Rarities
Trivia
This egg is featured in the Easter Basket.