In the game, Tyrannosaurus Rex and Magikarp belong to different hatching groups, so they can't hatch eggs together. When hatching eggs, it is necessary to put the babies in the same hatching group together to hatch successfully. If you want to hatch the eggs of Tyrannosaurus rex, you need to hatch with another Baokemeng belonging to the Tyrannosaurus rex hatching group. Similarly, if you want to hatch Magikarp's eggs, you need to hatch them with another Pockmarked Dream of Magikarp Incubation Group.