After defeating the Elite Four, go to Lilycove City. Go into the inn and talk to the man there. He talks about some people who call themselves Game Freak. If you go upstairs you will find them, just like in Celedon City in Pokemon Red, Blue, and Yellow. Also, go in front of the inn keeper watching television. He will get mad and yell, "Hey you, down in front! Move I can't see the television!".