No matter what Case you are presently working on, you will always need to collect clues with Tim and Pikachu in order to the solve the case at hand. Clues can come in a variety of different ways, but you primarily piece the Story of a case together by collecting Eyewitness Testimony and finding hard, tangible evidence. As you may figure, Eyewitness Testimonies are the information you will receive from other characters and Pokemon. As for hard evidence, these are items you will Find during each case that will be coupled with the Testimonies in order to solve the case.