Frank Einstein and the evoblaster belt. Book four - Jon Scieszka

In this fourth book in the New York Times bestselling series, Frank Einstein (kid-genius scientist and inventor) and his best friend, Watson, along with Klink (a self-assembled artificial intelligence entity) and Klank (a mostly self-assembled and artificial almost intelligence entity), once again find themselves in competition with T. Edison, their classmate and archrival-this time in a quest to unlock the power behind the science of life with Frank's newest invention the EvoBelt, which allows the user to evolve into other forms of life.