Quackenpoker is a Pokémon watcher with 50 years of experience and, in the dub, one of Tracey's idols. Tracey got the chance to meet him while traveling with Ash and Misty in the Orange Islands. When they met Quackenpoker, he was busy studying the Magikarp living on Rind Island. Over the previous three years, he had placed different colored bands on the base of the Magikarp's tails to help him identify them. Quackenpoker uses his camera and tripod to collect his research data, and like Tracey, he makes sketches of his observations.
Tracey and Quackenpoker quickly became friends. In fact, Tracey even helped him count how many Magikarp had evolved into Gyarados during their evolution season. Together, they discovered that more Magikarp had evolved while they were studying them than any other previous year.
Dr. Quackenpoker, at least in the English dub, is based on comedian Groucho Marx of the Marx Brothers, and particularly his character Dr. Hakenbush from A Day at the Races. Not only are his voice and appearance very similar but he also uses several of the same jokes. For example, the line, "When I was a boy, I woke up one morning and I saw a Magikarp in my pajamas. How a Magikarp got in my pajamas I'll never know," is adapted from Groucho's remark, "Did I ever tell you how I shot a wild elephant in my pajamas? How he got into my pajamas I'll never know."
Also, Dr. Hakenbush was originally going to be called "Dr. Quackenbush". Dr. Quackenpoker may be a reference to this.