At the final battle between Giorno and Diavolo in episode 38. Diavolo got punched many times, and got drowned to the river.
He survived that and able to catch the edge of the sewer stairs, kept his body floated. Poorly, he met a burglar/homeless man that stabbed him, he lost consciousness. Just after that, he looks like in a hospital bed, and a female doctor, suddenly did an autopsy towards his body. In the middle of autopsy he suddenly got teleported to the downtown where he got hit by a car, and last, he met with a child and for no reason Diavolo got scared.
What just happen to diavolo at episode 38 exactly ? According to Jojo's Wiki, stated
Gold Experience Requiem is a close-range Requiem Stand that boasts an incredible increase in both speed and power compared to its previous form. It also wields the arcane power of reverting anything to "zero", effectively undoing their actions; a power that trumps even the time erasure/nullification of King Crimson.