its in the galactic ware house in velistone
you go to the team galactic ware house
the galactic key is in the veilstone city ware house
simple answer go to Veilstone city and at the top right corner there is a team galactic building and in front of it there is a team galactic grunt talk to him and he drops the ware house key but here is a catch it breaks in the key hole after you use it and there is more doors so you have to find the galactic key... oh ya and one more thing the galactic key always works!
in the galactica ware house to the left of the galactica base NO NO YOUR A LIER
after getting your 7th badge go to veilstone city go to the galactic grunt and he will drop the key
the key you got from the team galatic grunt dropped is not the one that's for the team galatic ware house you need to open the ware house door with that key and fight your way through it to find another key and that one is for the team galatic main building. You can get additional info here at the related link. (good luck!)
You have to beat the snowpiont city gym then fly to Velistone city to the HQ talk to a galactic and will left a storage key and you will use it in the ware house.
Next to the head quarters in veilestone he will get scared and run and drop the galactic key
the glantic ware house is in velistone city.but i think you need a key.
first you beat the gym leader then fight the Galactic goons and get the Pokedex back the talk to Looker then goto the ware house when you get to the teleporters keep going intill you find a room with three boxes and a Galactic goon and theres 1 poke ball and that's the Galactic key
there's a guy in floarama meadow who gives you the windworks key after you beat galactic grunt
In the team galactic storage house connected to veilstone galactic headquarters.