You have to be decently close to the opponent when you initially throw the ball at them. Make sure you to do your full dodge towards them after the hit. Also you want to try to be underneath the opponent as much as possible after your tilt attacks so you can hit the up special. Some characters have bigger hitboxes and are easier to hit. The characters have different weights so it works at different percents for each character. Overall not the easiest/most practical combo but still cool lololol
