talk to the Team Galactic grunt outside and he will say something about the building and say this, " what secret key? i don't know about a secret key!" and then looker will come and you go in the warehouse and you explore and fight some grunts and then you find it. REMEMBER TO TAKE EVERY ITEM JUST IN CASE! just look around.
After you go talk to your rival at Lake Acuity fly to Veilstone City. Go up to the Galactic Building, not warehouse and you will see a grunt talk to him. After your done talking the Looker will come talk to you, when hes done go to the Galactic warehouse. The Looker will come in and open the door with his galactic key. Travle around inside using the warp panels and you will eventually find a key of your own.
First,get galactic key.(I don't no where)Go into big building and use it.
if you past the 7th gym then go back to veilstone city then go right and the go up then you se a guy next to the galactic Veilstone building then he drop his storage key.
It is to the left of the Team Galactic Headquarters (Galactic Veilstone building), but you have to go around the Pokemon Center and Veilstone department store. Once your behind the department store go up the stairs and there is the door. (Galactic grunts might be guarding the entrance, so beat Maylene, the gym leader. To get to her gym walk to the very bottom of Veilstone City, then walk al the way to the right. Go up the stairs and continue walking up until you get to her gym. It is located here for both Diamond and Pearl.
At Veilstone City,inside the Galactic Warehouse, there is an item lying on the ground. It is HM Fly. Teach it to a Pokemon and fly to any city you've been to.
After defeating the Galactic Team Leader Cyrus and Team Galactic Commander Saturn in Team Galactic HQ of Veilstone City, they permit you to set them free by pressing a button to unlock all the capsules. You can meet the trio again in their home lakes after encountering Dialga.
Go to Veilstone city and beat the gym leader. Then the professor's assistant will tell you that his/her pokedex dropped and then two galactic grunts picked it up. The 2 of you go to the galactic warehouse and 2 grunts are guarding it. Once you beat them in a battle, they rush back into the warehouse. The professor's assistant will thank you, then leave. Enter the warehouse, inside you'll find tm3 fly!
From Cyrus after you beat him at the Galactic Veilstone Building (4th Floor)
Cyrus is in the galactic building in veilstone
defeat team galactic boss at the team galactic veilstone building.
veilstone team galactic base veilstone team galactic base
you use it in the galactic building in veilstone city, but only on certain doors
Galctic Headquarters is actually the Team Galactic Veilstone Building, but you'll need a Galactic Key to enter most of the doors.
He's in the Galactic Veilstone Building, and on top of Mt. Coronet. But not after he leaves Mt. Coronet.
u can find him in the galactic building in veilstone (p.s its not the galactic ware house
In Veilstone city
frst defeat the gym leaderthen go to the team galactic headquarters the one that is small. then when you have accomplished that you can go there!
Try to find your way to the boss and battle him. Then you can go through the door in Mt. Coronet.
All you have to do is Batlle him and get the Galactic key card