Instructions
Win all ranks, Normal, Super and Hyper, in each of the five contest categories at the following Contest Halls: Verdanturf Town, Fallarbor Town and Slateport City respectively. After winning the Hyper Rank in each contest category in Slateport City, you can participate in Master rank contests at Lilycove City.
Enter a Pokemon into any of the five Master rank contest categories at the Contest Hall in Lilycove City. The contest hall is to the south of the Pokemon Center in the middle of the city.
Win the Master rank contest with at least 800 points to have an artist paint a picture of your Pokemon to display at the Lilycove Museum.
Win the Master ranks in the other four categories to completely fill the second floor of the Lilycove Museum. Speak to the museum curator to receive a Glass Ornament for your hidden base as a reward.