no you cannot. except if you use cheat.
You have to drop the boulders into the holes (where the lake Pokemon are floating) and then you have to find Giratina. You have to beat Cyrus first, and then you battle Giratina... you can catch him, or defeat him.
After you defeat the Pokemon League and receive a National Pokedex, you can go to Spring Path and follow it all the way through. Eventually, you will encounter Giratina.
Yes but only if you defeat it in the Distortion World. After you beat the Elite 4, it'll be in the Turnback Cave.
after you defeat Cyrus you can battle dialga then you battle the three lake Pokemon and move on to sunnyshore city. then you go on to defeat the elite 4.
No, After U Defeat Him In Diamond/Pearl/Platinum U Defeat Him He Compleatly Dissapears
You will have to find the three Pokemon of the lakes, they at the places where you have to push the bolders. And this is important! Make sure you bring a Pokemon with strength! And before you battle Giratina, you will battle Cyrus, and you have to defeat him!
Maxinum battle points i think it is 20 if you defeat Tower Tycoon Palmer.
Go to Spear Pillar then you and your friend will have to battle the two cammandors and after you defeat them you battle Sirus, the Galactic boss after you defeat him you can now catch dialga
you have to go from Oreburgh City or Hearthome city into Mt.Coronet then to the spear pillar and defeat giratina then go back and it will be open!
defeat the elite four
yes, you can also get both dialga and palkia .(if you defeat them there in the wild) If you beat giratina, he'll be in turn back cave.
To get a Manaphy in Pokemon Diamond you have to get Pokemon ranger and defeat it and you have to trade it to Pokemon Diamond,Platinum or Pearl.