Leviathan

The Leviathan is a secret Legendary pet in Bubble Gum Simulator. It was obtainable from the Frost Egg on the Festive Island while the Christmas 2018 Event was active. It had a 1 in 8 million chance (0.0000125%), or 1 in 4 million chances (0.0000250%) with the Lucky Chances gamepass, to get Leviathan.

Trivia

 * In Update 9, the Leviathan was the 2nd most powerful pet a player can obtain but soon overpowered by the Dogcat, Giant Robot and Evil Shock after they were released.
 * The Leviathan, Dogcat and the Giant Robot have the lowest chances of being hatched from an egg, making them the rarest hatchable pets in Bubble Gum Simulator.
 * This pet was hinted in one of Isaac's tweet.
 * This pet's stats are almost double the Overlord's stats, which was the best pet in the game before the Leviathan was released.
 * This was the first secret pet hidden in an event egg.
 * This was the second secret pet in the whole game.
 * This pet has a reskin which is Sylently's Pet.