Defeat Gar'Skuther. Then, replay planet Tapti. There is an island that you can reach by having the water walk ability. Go to Fryse, which is the first region. Near the place where you exit into the cave to go to the next continent, look in the water on the top screen map. Notice that the water is dark blue and crossable. Go southeast until you get to an island. On this island should be a Skuther, two Oogies and a pollinated creature. These two Oogies are from the other eggs that yours was with at the beginning.