you have to go to the warehouse and you will eventually find it
just go wid the story basically
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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 find it in the basement of the Galactic Warehouse
you go to the game corner in veilstone city.
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)
go in the warehouse and go to top floor, and go in room 2 the right room