after you've got the hidden move Strength make your way toSnowpoint city. Then you must beat the gym leader and go to Verity Lakefront, Valor Lakefront, and Acuity Lakefront. Then go outside the Veilstone HQ and get the storage key then you must go to the storage HQ in Veilstone and you will find the galactic key to the team galactic HQ in Veilstone.
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.
Beat the 7th gym leader go to veilstone and go to the HQ and talk to the grunt and he drops the key
it is not really secret but there is the building in the north part of eterna city and a building in north veilstone city
He is next to the satellite by the veilstone Galactic building
The Special Key is a key item in Pokemon Diamond. You can find this item in a warehouse in Veilstone City.
You find it in the basement of the Galactic Warehouse
Near by the satellite upper part of veilstone city.
talk to the team galactic guy in front of the team galactic building.(In veilstone city)
It is the warehouse in veilstone city.
keep using the warp pannels and you'll find it :)
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.
then complete the stages and battle some galactic team members to find your self facing a galactic boss, he will then tell you where jupiter is with the three pokemon
after you've got the hidden move Strength make your way toSnowpoint city. Then you must beat the gym leader and go to Verity Lakefront, Valor Lakefront, and Acuity Lakefront. Then go outside the Veilstone HQ and get the storage key then you must go to the storage HQ in Veilstone and you will find the galactic key to the team galactic HQ in Veilstone.
you go to the game corner in veilstone city.
When you go to the galactic building in veilstone' go through the it and you will eventuly find it
Veilstone Werehouse. Run around and you'll find it in a Poke Ball.