Credit goes to Perfectly.Patches

Blaziken and Lucario paid Mercury to participate in an underground fighting arena. He was doing at winning and easily made it to the Finals. However they soon bet against him, he eventually found out which resulted in their contract being broken. He decided to take advantage and took a dive, both were shocked. As they were leaving, they saw Merc getting all their bet money and since they broke a contract, he used his diaper breathe to diaperfy them. He decided to wear the leader and use his accomplice as a stuffer, and to torment them more, he gives them a big hearty slap on the butt. He basically got alot of money and 2 free diapers.

Lugia, Lucario, and Blaziken belong to Game Freak
Mercury Quicksilver belongs to Me.