If you don't want the hassle of having to purchase ten Poke Balls at full price to receive one mere Premier Ball for free, there is actually a way to get as many Premier Balls as you would like for no charge at all! In order to do this, go to the Thrifty MegaMart on Akala Island were you will always receive a 50% off coupon at the door. From there, purchase the usual ten Poke Balls to receive your free Premier Ball. After doing this, sell back your Poke Balls for the same purchase price you just paid (since sell price is always 50% on the retail purchase price).