Gym Heroes was released in August of 2000 and was the 6th Pokemon Set printed by Wizards of the Coast! Shortly after we got the Gym Challenge set and collectors confused the two ever since ! Ultra Pro Acrylic Booster Box Display for Pokemon Ultra Pro Pokemon Booster Box Acrylic Case (6) Chief Cards It took him three years to collect all 31 1st Edition sealed Pokmon booster boxes. Now, they're up for sale for $6 million Each box is factory sealed, mint condition, and It took him three years to collect all 31 1st Edition sealed Pokmon booster boxes. Now, they're up for sale for $6 million Each box is factory sealed, mint condition, and