this is a bit complex. moreso than it seems.
see, when you first beat veilstone gym, youll be greeted by someone who ahd their pokedex stolen, theyll take you up to a double battle against 2 grunts.
afterwards, youll get to go inside the first room and get HM02 FLY.
then you just have to continue normally, until after snowpoint city and all of the events that take place.
after defeating Cindy (the gym leader), youll end up having to to the final lake, and then to the galactic headquarters.
THIS time, there will be a grunt standing in front of the HQ building, who will run off after you talk to him, after which, you the detective will take you into the warehouse and open the door.
hope that helped.
In the galactic warehouse to the left of the Galactic HQ
one of the scientist in the galactic warehouse.
The Storage Key opens the Galactic Warehouse in Veilstone City. It is dropped by a Galactic Grunt in Veilstone City after you beat Jupiter at lake Acuity.
Galactic Werehouse is in Veilstone City (west/left side) right inside coming from Solaceon Town
in vielstonecity right next to there headquaters
In The Galactic Warehouse.
Veilstone City
In the galactic warehouse to the left of the Galactic HQ
in the galactic warehouse
Veilstone City
It is located in Veilstone City.
one of the scientist in the galactic warehouse.
You can find it at the Galactic Warehouse in Veilstone City.
in vielstone city (were the fighting type gym is)
The Storage Key opens the Galactic Warehouse in Veilstone City. It is dropped by a Galactic Grunt in Veilstone City after you beat Jupiter at lake Acuity.
Galactic Werehouse is in Veilstone City (west/left side) right inside coming from Solaceon Town
the glantic ware house is in velistone city.but i think you need a key.