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.
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In the galactic warehouse to the left of the Galactic HQ
you MUST beat the snow point gym leader to get the key. After you beat the snowpoint gym leader you go to the Team Galactic warehouse located right of the veilstone shopping center and battle and beat a team galactic guy. Then he will drop the key and you pick it up. I hope this was helpful to you! :}
in team galatica's warehouse key needed. also digging underground
You find it in the basement of the Galactic Warehouse
The Galactic Grunt in Pastoria City has it. You need to bet the Gym to get it.