you have to go to the flaomora village and find the gate that is thesame when you got your starter pokemon and battle the galactic grunts and somoene will give you the key this is janbern P.alimes
When you go to the team galactic veilstone building there will be a galactic grunt and you talk to him then he'll run away and he accidentally drops a key.
talk to all of the team galactic members outside of the building and one should drop a pokeball containing the key when he runs away
you get the special key through the mysterygift
in the vilstone warehouse next to the galactic building
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
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!
You get one from cyruce in the team galactic HQ. You have to get a key which the galactic guy gives you at the front of the building
talk to the team galactic guy in front of the team galactic building.(In veilstone city)
You get it from the galactic grunt thats outside the galactic building, or from somewhere inside the building. XD LoL
You talk to the galactic grunt and he will run away. Then go to the small building to the left and the looker will be there. Follow the looker and getthe galactic key. Now you can get in the door in the galactic building in veilstone.
You find it in the Galactic Headquarters after they capture Azelf, Uxie, and Mesprit.
u catch girantina and then after that you go to veilstone city and go talk to the team galactic person in front of the galactic warehouse I think galactic warehouse it is one on the team galactic places in veilstone city and then he will go somewhere and drop a key which it will be the storage key. Hope this helped and sorry I cant think of the name of the team galactic place it is the biggest building of the team galactic places (in veilstone city)