Go to anybody's house in your game and watch the TV when its flashing when it says the dept store will get a cleareance sale it will say its in 2 days wait one day watch tv again it will say 1 day left then wait another day watch tv again and it will say the cleareance sale is currently under way. Psst buy expensive stuff right now cause its cheaper PLUS go to the roof of the dept store and a girl will sell you cool stuff for your secret base.
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After you beat the elite four, wait till the tv in a random person's house flashes. It could be the rooftop sale. Then if it is wait two days and watch the tv again and go to lilycove department store!
In order to activate the Rooftop Sale on the roof of the Lilycove Department Store you need to have beaten the Elite Four, and it appears randomly. A helpful tip to find these random occasions you need to check in with the Pokemon News Station.OP6
They are only available at the special sales in the Lilycove Department Store. They are held at the rooftop. To find out when those sales are occurring, watch the televisions inside of houses. It will tell you how many days are left until the sale occurs.
You have to beat the Elite Four (it's all chance, there are other events for this) and go to the nearest TV that's on (you'll know; the screen is flashing). It'll either say that the berry master will arrive in a certain amount of days to Lilycove, that there will be a sale in the Lilycove Department Store, or that the chance of getting bigger earnings in the casino in Mauville will go up. Remeber, if you don't get it the first time, beat the Elite Four again.