This was my most used ball in the games, so it's my fave of your set... I liked the ultra ball's colour, it fitted so well with most of my water type pokemons! XD I loved to catch them with a good pokeball to match the colours and blue/yellow is a great couple in my opinion ¨.¨ Great job as usual :3
As I said on my comment in the pokeball one, it's really good! I love the shading and textures, so smooth and simply, tempting me to press the button and see what pokemon is inside. The colour that you chose for the yellow stripes is perfect, as when drawing Ultra balls lots of people use a bright yellow, when it ins't actually bright. Great work!