level your Pokemon up to 80
You have to head off to Snowpoint City by going through Mt. Coronet.
go tospear pillarafter rescuing the lake Pokemon before you get to dialga you must beat mars, Jupiter and the head of the team galactic the you will be able to battle him
with empoleon ,infernape and torterra
If you battled Jupiter already, you have to go to mt. cornet and then go to the top to battle them and Cyrus.
Go to mt Coronet, beat Mars and Jupiter and you will see a portl
beat mars in valley windworks
when your at the peak of mt.cornet it will say spear pillar. There you will have to battle mars and jupiter but not alone your raival will assit you and after the battle he will fully restore your pokemon to full health. Then you will have to battle cyrus when you beat him you will have to battle dialga(palkia,giratina depending on whatever version you have.
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.
You have to beat all the team Galactic Grunts, then your rival will show up and you two will have a tag battle with Commander Jupiter and Mars, then you get to fight the boss who has Pokemon around level 47, and the boss has already pulled Dialga out of it's dimension. Dialga wants to test you, and then, IT'S ON!
Mars does not appear at lake acuity. If you beat mars at lake verity then go to the upper part of mt coronet and explore until you reach snowpoint city. If you're at lake acuity and beat Jupiter then go to the galactic HQ in veilstone city.
Lisa ortis plays mars in Pokemon
Pokemon Diamond and Pearl's Team Galactic are ruled by 3 commanders (Mars, Jupiter and Saturn) and the Boss Cyrus.