Location: Thrifty Megamart, Akala Island This trick is possible since you always receive a 50% coupon at the door. Speak to the lady in red and purchase at least 10 pokeballs at a time to get your free premier ball. Simply sell back your pokeballs for your purchase price and repeat. You can speed up the process by simply pressing Right on the D-Pad which will auto select 11 pokeballs.