Johnny's Stolen Wallet is a discovery sidequests in Chapter 14, "In Search of Hope", in Final Fantasy VII Remake. After tracking down the thief who stole Johnny's wallet, Cloud Strife, Tifa Lockhart, and Barret Wallace return it to him.
Johnny is found in the Sector 5 Undercity Station again, which can be reached by chocobo travel from the Sector 5 slums church, or walked to by walking south. Talking to him will lead to a cutscene, after which the quest concludes.
This quest yields no major rewards, but is one of many required for the trophy "The Johnny Experience".
Though not part of the quest, an NPC at the station gives the Descendant of Shinobi disc when spoken to.