The Magician is Rakutsu's associate. He provides Rakutsu with supplies, such as enhanced pokéballs, and checks Rakutsu's health. Rakutsu pays him for these services.
When Rakutsu arrives at the Magician's house in Aspertia City, the Magician does a medical scan and gives Rakutsu special coverings to increase his pokéballs' effectiveness. He and Rakutsu communicate via Xtransceiver during Rakutsu's ensuing battle against Colress.