Mystery Gift For Pokemon Diamond

Go to I think the third floor (I think or fourth whatever it is) there'll be a man next to a girl go talk to him and he'll say "What do you think about Jubilife TV?" and you'll say EVERYONE HAPPY. Then he'll say "Thats interesting tell me more.". Then say WI-FI CONNECTION. Then the guy will say somthing then save and turn off the game and on the opening screen (where you can do the option to do a new game) and you'll have a box that says Mystery Gift! I'm not sure how to work it though but you can get those pokemon through the Action Replay no sweat though.