Mine are the Hisuian balls, specifically the Hisuian ultra ball. I just love the design of the latch, and the color palette used for all the balls. I especially enjoy the little flourish on the yellow stripes of the ultra ball!
What's your favorite? Any particular reasons why?
I wrote this comment when I was half asleep so I just copied whatever term the guy below me used😭
Hahah! Well, now that it's been pointed out I can't unsee it. It does look like a zipper. Professor Laventon put the zipper on facing the wrong way to open the pokéball though. 😭