I discovered a neat little feature when playing ORAS. If your 3DS's clock is set for your birthday, then when you enter any Pokemon Center the lights will go dark upon your entrance and confetti will blow out. Not only that but Nurse Joy will wish you a Happy Birthday, the screen in the background will have a birthday cake on it, and the Pokemon Center's music will be different.
(My 3DS clock is a day behind, my Bday is the 21st of November, but it's the 22nd in my timezone, so I have to fix that soon.
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X/Y pretty much had the same thing, but at least it's there.