You have to save the legerdary Pokemon (if you're there you should know what I'm talking about) so head up there by using a warp panel, there should be one close by. Once you get there, beat Saturn (he has Kadabra Lv 36, Bronzor Lv 38 and Toxicroak Lv 40)and he will tell you how to release the Pokemon (push the red button)after your done go to spear pillar to get Dialga! ;)
Trust me I have the walktrough (you could've just seached on Google for a walktrough!)
Galctic Headquarters is actually the Team Galactic Veilstone Building, but you'll need a Galactic Key to enter most of the doors.
in veilstone city the team galactic warehouse the HM fly will be their.
If any of your Pokemon's ID numbers match the loto number completely you win one in Jubilife City. You get it in the Veilstone Galactic Building. Or when you beat Cyrus
First, you must beat the seventh gym leader (Candice in Snowpoint City). Then, go to the Veilstone Galactic building and there should be a grunt standing outside by the sattelite that is to the right. Talk to him, and he will talk to you then run away. He will drop an item. Pick it up. It is the Galactic wearhouse key.
in veilstone city in the galactic warehouse. ( in plain sight )
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