The Kraken in Bubble Gum Simulator is a secret legendary rarity pet and can be obtained by opening the 400M egg. You can find the 400M egg in the Overworld for 125k gems. The chance to hatch the Kraken is 0.0000153%, equating to 1 in 6.5 million, so it’ll be hard to hatch. But if you are desperately really looking for it, you can search for trade offers for the Kraken in-game and online.