you go all the the way to the top of warehouse then you beat cyrus and there is a green button and you go on it
You have to beet Maylene in Vielstone gym. Dawn/Lucas will ask for your help. Then you beat 2 grunts and you can get in the warehouse. Later, after you beat Jupiter at Lake Valor, Mars at Lake Verity, and Saturn at Lake Acuity, you can beat a Galactic Grunt in front of Galactic Vielstone HQ. After you beat him, he drops the Warehouse Key. Then you can go deeper into the warehouse.
Pokemon Diamond and Pearl's Team Galactic are ruled by 3 commanders (Mars, Jupiter and Saturn) and the Boss Cyrus.
Team Galactic just basically leaves after you beat him...except for Saturn
After defeating the Galactic Team Leader Cyrus and Team Galactic Commander Saturn in Team Galactic HQ of Veilstone City, they permit you to set them free by pressing a button to unlock all the capsules. You can meet the trio again in their home lakes after encountering Dialga.
The final battle with Cyrus is held on the highest point of Mt. Cornet. He tries to summon the legendary Pokemon to rewrite the universe. Cyrus disappears after his defeat leaving Team Galactic to Saturn.
you have to save the little boy's father in the galactic etarna buliding get to the top then beat Saturn then go to the bike shop talk to the father he will give you the bike
Go to the Pokemon spa there for 365 days in a row. On the 364 day Commander Saturn will be there and ask you to join team galactic!
He is in one of the Galactic Buildings where he is keeping the Lake Guardians, Uxie, Mesprit and Azelf, hostage.
Azual is not a character in diamond there for you cannot find him however what you do after you beat Cyrus is go back and beat Saturn
simple, just get into the warehouse, find Cyrus in the building, destroy him, find Saturn, defat her, and poof, they leave.
Commander Saturn is at spear pillar in Pokemon pearl.
u have to battle Saturn at the veilstone building , then he releases them