Once seven characters have held the championship belt, two reward matches will appear sequentially on the arena. If the sixth character to hold the belt was a face character, there will be three reward matches. You must first defeat and unlock their heel alter ego on the Skyscraper.

Lady X: Defeat Lady X in the Reward Match. She becomes available in the shop for 20,000 under "Others".
Lady X Subsistence: Defeat the tag team of Lady X and Dr. Anesthesia in a Handicapped match. She becomes available in the shop for 30,000 under "Others".