Here are the prizes:
1: Master Ball 2: Rare Candy 3: PP Max 4: PP Up 5: Max Revive 6: Max Elixir 7: Max Ether 8: Ultra Ball 9: Full Heal 10: Berry Juice
If possible, do it per rank.
Once per day, the player can win a random prize from the raffle. Unlike other shops, the Raffle Shop's merchandise pool doesn't increase as it levels. Instead, the player's chance of getting a top prize is increased.
http://bulbapedia.bulbagarden.net/wiki/Join_Avenue#Raffle_Shop ___ So basically, as the raffle gains levels, the chance of drawing something high in the ranks is increased.