u catch girantina and then after that you go to veilstone city and go talk to the
team galactic person in front of the galactic warehouse I think galactic warehouse it is one on the team galactic places in veilstone city and then he will go somewhere and drop a key which it will be the storage key.
Hope this helped and sorry I cant think of the name of the team galactic place it is the biggest building of the team galactic places (in veilstone city)
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You find it in the team galactic storage area.
The Storage Key opens the Galactic Warehouse in Veilstone City. It is dropped by a Galactic Grunt in Veilstone City after you beat Jupiter at lake Acuity.
You can only get the secret key in Pokemon Platinum
platinum is coming to America in 2009 ask someone in japan
i think the key is "ENTER"