The lottery in Jubilife City can give you a variety of prizes, including:
* Rare Candies
* PP Ups
* Hyper Potions
* Max Potions
* Revives
* Rare items like Nuggets, Apricorns, and other useful items
While Master Balls are the rarest item in the game, they are not obtainable from the lottery. You can acquire Master Balls through other means, such as:
* Finding one in the Grand Underground
* Winning the Battle Tower
* Getting it as a reward from the Battle Frontier
Keep in mind that Master Balls are very rare and there are limited ways to obtain them in the game.