for diamond it is palkia and for pearl its dialga. u dont have to trade though.once uve got to the elite four(dont have to beat them) go to celestic town and see the old lady.she will show u a book with a pic of palkia/dialga.it will transfer to ur pokedex. Hope this helped
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You can the Pokemon from the johto region once you have the national pokedex. To get the national pokedex, catch 60 or more Pokemon from the kanto region then go and see prof. Oak in his lab in Pallet town.You can't.... But you can get johoto Pokemon in the game and from Pokemon colluseam.
You have to have at least 60 different kinds of Pokemon on your pokedex then go talk to professor oak. your rival shall also appear and he will give both of you a national pokedex.
You have to catch at least 60 Pokemon and you have to beat the elite four including your rival
You Must Capture, Trade, Or Evlove 60 Pokemon
== == == == First u hav 2 complete the Sinnoh Pokedex, then go to to your prof., and you will get da national pokedex.This special upgrade is given to you by prof oak after becoming a Pokemon champion that means you defeating the elite four and the current champion who is your rival. Also besides that you will need to register 60 different kinds of Pokemon in the pokedex if all that is accomplished show prof oak your pokedex to receive the upgrade!