he is at spear piller and in team galactics vestone city hq
By beating commander Saturn
First of all it's Dailga and what you do is go to Spear Piller ( in Pokemon Diamond ) and battle the first two Team Galatic grunts, then two Team Galatic leaders, then the Team Galatic commander, then you battle Dailga and use a Master Ball and if you don't have one I can't tell you what to do besides do what you normally do with other pokemon.
Help the little girl and defeat commander mars.
In Vielstone city
u gotta battle all the team galatic first and then go into the cave and battle the commander. then everything is back to normal when you come out.
After defeating Galactic Commander Jupiter in Eterna City, you can now go get a bike from the bike shop (Eterna City) and travel down Cycling Road to Oreburgh City and then to Hearthome City.
You mean the galatic key? go to the galatic warehouse.
he is in the room that you fight team galatic
In Veilstone City.
you get it in team galatic HQ
Team Rocket Team Rocket
Well you know how team galatic had all of those funny names like Jupiter and mars and Saturn, im guessing it's a new team galatic member. =]