When you dress up your pokemon you have to add an object to their arm, and on the bottom screen you will see the object. tap it in order to use it. Examine the times when the computer uses them in order to decide when to use the items.Also certain items will be thrown, twirled or will blink. If your rolling twirling objects are good. If you are jumping items that are thrown are good. if you are bouncing , using blinking objects will work.