I made this for Scholar Owl for Xmas 2016.
I didn’t use a pattern for the Pokeball. I created as I went. Maybe I can make another one and draft up a pattern for it. The basic idea is that you make 2 red domes and 2 white domes. Then you do a row around the top of the 2 domes together to attach them. With the red dome you add the latch. On the white dome you add the button. Sorry, I didn’t take a picture that let’s you see the latch. I made a rectangle and put it between the two domes so that it made a hinge.