While training his Lucario on how to use their aura abilities, Ash Ketchum would find himself undergoing a strange and unexpected transformation. His body began to glow and change as aura began to flow through him, causing his body to swell and expand. He watched in a mix of shock, confusion, and horror as his stomach swelled outwards, pushing up his shirt, his hips began to expand, tearing apart his pants, and even his chest began to grow larger and rounder, until they burst through his shirt, and thick blue fur began to grow all over his body. Before long, the young trainer was completely transformed into a plump and chubby female Lucario!