Get the Adament orb from a cave on the way up to Spear pillar than once you have the orb go to speat pillar and there should be a blue portal interact with it and you will be battling Dialga master of time
top of mt cornet
You can't catch Dialga in Pokemon White. After you beat the the Elite 4, you can use the PokeTransfer to receive a Dialga from Pokemon Diamond, or Platnium.
Dialga and Palkia. You have to battle the Galactic Leader and then catch Giratina. They will be waiting at the spot where you catch Dialga in Pokemon Diamond. You will battle Dialga and then Palkia, both of them being at lvl 70. Be sure to bring some ultra balls or master balls if you have any. Hope this helps!
After you catch Giratina, go to Celestic town and back to the Spear Pillar. A blue or purple cristal will be floating will be seen. The blue or puple crystal will be Dialga or Palkia. To catch the next one leave Mt. Cornet and re-enter Spear Piller. The next Dialga or Palkia will be there. I only say Dialga or Palkia because I don't remember which one comes first.
after u get the national dex and catch dialga and palkia and the three lake Pokemon talk to oak in eterna and they apear on ur map
you cant catch it in platnium but you can trade it
No
go to the cave above waterfall in mt cornet on left is adamant orb on right the lustrous orb(may be in reverse). Then you go to spear pillar where there are to hole in time and space that allow you to battle dialga then another that allows you to battle palkia.
If you beat Dialga and Dialga faints, you can no longer catch it.
It depends on which game. you can catch dialga on pearl with a code
Mt. Coronet right behind giratina
You can catch it by first turning Dialga's HP into the red. Then use Ultra Balls or Dusk Balls to catch Dialga. It will take time, and you need to use a few balls to catch Dialga.