In Celestic Town, there is a house and in that house there is a book with Dialga in it. After reading this book Dialga gets added to your pokedex which means you can do wifi trades for it.
you do not find dialga in Pokemon pearl
you find dialga in mount coronet
Trade with Pokemon Pearl or Pokemon Platinum
It's simple Spear Pillar but it's not easy getting there at all.
you dont
you cant
I think you mean Pokemon Pearl. The same place you find Dialga in Diamond. On spear Pillar. Come on, that was an easy one.
You can't without cheating.
you need to trade for them
dialga and palkia
Well I believe you find them at the pillar..... :)
if you own diamond you find Dialga if you own pearl you find Palkia