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.
you need to have been to lake acuity and then the team galatic headquaters in veilstone city.
You can find Fantina outside the door in the contest hall.
Eterna City pokemon center. The first chick by the door if I recall correctly.
If you received it by mistery gift, the door should open normally. if you put it there with pokesav, you can't.
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.
It,s in eterna city
to find the warehouse in veilstone.....you first need to get a Pokemon that knows the move dig. then you go to one of the rocks that are there and use dig. Youll have to keep walking and then you will find the warehouse.the warehouse is by the department store in veilstone city but you need a key to open the door or if you have action replay you can always use the walk through run through cheat. elimac3
You find it in the basement of the Galactic Warehouse
go to galactic headquarters in veilstone city then you need a galactic key and the storage key to open the door of team galactic's door
go to the were house by the base in veilstone city. looker should be there he will open a door go in and it is in there!
All you do is go in front of the team galactic veilstone hideout and talk to the guy in front. then he will run away and drop a key. so that's how you get in.
You talk to a man standing in front of the main building in veilstone. If there is no galactic grunt, and you already beat the veilstone gym, just continue on with the gym leader challenges and come back after the battles at the lakes(which come after the canalave gym)
Head back to Veilstone City. When you arrive at Veilstone City, make your way to the Galactic HQ and talk to the Grunt standing next to the satellite dish. He'll drop the Storage Key before running off. Pick up the key, and head to the Galactic Warehouse to unlock the rusty door. You'll now be in the inside the Galactic HQ.
the sapphire is in the warehouse and to find the second code go to the dotted hole and use cut on the door, hope this helps
Try to find your way to the boss and battle him. Then you can go through the door in Mt. Coronet.
The storage key is used to open the locked door in the small warehouse in Veilstone city where you can get the HM02 Fly (that's in the warehouse after getting the professor's assistant's pokedex back, you don't need the key for it). After unlocking the door you go down the stairs and battle a bunch of galactic grunts, and later you can find the galactic key and open the locked door in the galactic main building (it's the building that the first grunt dropped the storage key in front of earlier). After going down the stairs there and battling more grunts, if you defeat Saturn you can save the lake guardians (that's Uxie, Azelf, and Mesprit). Hope this helps!!
defeat team galactic boss at the team galactic veilstone building.