In Vielstone city
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In Veilstone City, to the right if you go all the way there is the Team Galatic headquarters. Go in there and fight your way through and get all of the pokeballs, eventually you will get the key to the warehouse.
There is no code. You have to go to Veilstone City and beat Team Galactic and the Gym leader. After that go to an opening in the left where you battled Team Galactic (Team Galatic Warehouse) and you will find the HM Fly.
First there should be a galactic grunt outside the headquarters. Talk to him to get the key to the warehouse. Go to the warehouse which is also in veilstone city. In the warehouse you should find the key to the headquarters.
you get it in team galatic HQ
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.