After which gym do you find Dialga in Pokemon Diamond and where? - Answers

I think it's the seventh gym ( so you can get into Lake Acuity) Take part in the events there and then fly to Veilstone City and get into the Galactic Warehouse (its on its own right next to the big building) There is a Team Galactic Grunt here who runs off and leaves a key behind. Pick up the key and get into the Warehouse. Find your way through under the Warehouse into the main building and then find your way to the top of this building and fight Cyrus. He gives you the Master Ball when you beat him, and then head into the teleport that takes you to the prison cells that hold the 3 Legnedary Psychics. Release them, and then some Galactic Commander runs up behind you and takes the red chain thingy. After that, go to the entrance to Mt. Coronet that is on the left side of Hearthome City. You need Rock Climb also. This can be found in the snow on Route 217 (where you can barely see on account of the blizzard) Find your way around to the side in here that has the spot where you can Rock Climb. Find your way around in this natural maze (sorry I can't be more help here but I forgot how to get there) till you find your way to Spear Pillar. I can tell you this, if you get to a point where there is one lone Galactic Grunt who doesn't fight you and is standing in front of a doorway, you've gone the wrong way, so go out and find your way further up from that location. Once at the top, save, and then enter the partner battle with your rival against the Galactic Commanders. After that, fight Cyrus again and then watch as he calls forth Dialga. Before you fight Dialga, the three Legendaries that you freed earlier come and limit his powers. Now, fight Dialga and try to catch him with an Ultra Ball. This is pretty easy as he is only at Lv. 47, and I caught mine with just 3. Congrats, you now have Dialga! wow