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.
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In the galactic warehouse to the left of the Galactic HQ
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.
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.
A key to the Galatic world. In the Galatic world there are alot of dumb Galatic people and they are all named MAX STABS
go in the warehouse and go to top floor, and go in room 2 the right room