A girl says her daddy is in trouble, so apparently to have to go to his rescue. When you get to valley windworks and beat the team galactic grunt, he goes into the windworks and locks the door (the nerve). So now you need to get the key, which is conveniently located above Floroma town, but you have to beat a team galactic grunt to get it.
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You have to get the key from the wind works and then you could open it.
you get the valley wind works key from one of the galactic Grunt when you save the honey farmer at the top left screen of Floaroma Town
You can only get the secret key in Pokemon Platinum
in a valley where wind is
platinum is coming to America in 2009 ask someone in japan