In One Piece Chapter 1096, "Kumachi," the origins of Bartholomew Kuma and Kaido's Devil Fruits were revealed. They were initially prizes for the Celestial Dragons' Native Hunting Competition on God Valley. Kuma's group, including Emporio Ivankov and Ginny, lured the Rocks Pirates to the island and used the chaos to steal these coveted Fruits. They didn't know it, but Ivankov was about to eat the Fish-Fish Fruit, Model: Azure Dragon. Of course, Charlotte Linlin burst in on the kids and wrestled the Fruit out of Ivankov's grasp; this would allow her to give Kaido the Fruit later that day.
Source：https://www.cbr.com/one-piece-ivankov-kaido-devil-fruit-switch/
