dialga palkia and giratina

You can't. You have to trade them over from Diamond, Pearl and Platinum, respectively.

I'm sure someone in our Pokemon Trading Forum will be happy to trade them over to you, though. Why don't you check it out? Here's the link:

Http://forums.supercheats.com/forums.php?forum=1791

As to what level they're found at, it's level 40 for all three.

If you have a fateful encounter Arceus as first Pokemon in your party and then go to the Ruins of Alph you can choose ONE of them. They will be at lv. 1 and hold the respective orbs.

you have to have the movie arceus and the jewel life and then talk to cynthia and arceus will be on your side and you can only get dialga or palkia or giratina other wise to get all three you have to do it three times you can get it a different way but that way you have to get it out of diamond and pearl

You have to have an arceus and then try to go into the house in the ruins of alph then youll be on youre way. You can only get one of them and theyll be at lv. 1. You don't have to catch them.

You have to have a legit arceus and go to the ruins of alph go to the house there and then a man will come out of it then you both will go inside the ruins and then you will be transfered to the sinjoh ruins where you have to go inside the house at the sinjoh ruins and talk to cnythia the champion then you will go to the place where there is a big triangle on the floor then you get to chose a dialga palkia or giratina

You go to ruins of Alph with Arceus as your first pokemon. A man will run into you outside the research house and then he will take you into the ruins of Alph. It will go black and you'll land in a different ruins. Go outside and talk to the hiker. Then go back to the cabin and talk to Cynthia. Then she will go into the ruins. Deposit all your Pokemon except Arceus into the PC. Save at this point. Go back into the ruins and talk to Cynthia. Choose Which Pokemon you want (Dialga, Palkia or Giratina. You can only have one) after watching a certain movie depending on what Pokemon you choose you will then get it in your party at level 1. If you want to change Pokemon you'll have to turn it off and go through it all over again. If you want the others you'll have to trade them from other games. Hope it helps =)

You have to have a movie Arceus in your party and only the Arceus. After beating the elite four, go to the house in the ruins of alph. A man will take yoou inside and you will end up in the ruins of Sinjoh. Then go on the stage and choose either dialga, palkia, or giratina. Not all three. They will be level 1 and in an egg.