Hi Lucas is the professers assistant. He has the third starter Pokemon (the one you or your rival haven't picked).
yup
yes he does
trade diamond from Pokemon diamond onto Pokemon pearl
lucario
You trade Magmar from Pokemon pearl,diamond,or platinum to ether Pokemon pearl,diamond,or platinum.
THE POKEMON THAT ARE NOT FOUND IN DIAMOND AND PEARL ARE:MANAPHY PHIONE
diamond
You can get Palkia in Pearl, otherwise you have to transfer Palkia from Pokemon Pearl to Pokemon Diamond.
No, you can't catch Deoxys on Pokemon Diamond & Pearl unless you have cheats. You can transfer it from your GBA to Pokemon Diamond and Pearl though
some of the Pokemon are different such as diamond has dialga and pearl has palkia some of the Pokemon are different such as diamond has dialga and pearl has palkia
No, In Pokemon Diamond & Pearl you can choose Lucas or Dawn and travel through Sinnoh Region, But in Heart Gold & Soul Silver you can choose Ethan or Lyra and travel through Johto and Kanto.
Palkia is the legendary Pokemon in Pearl, and there is also various Pokemon found in Pearl, but not in Diamond. Diamond has some, that Pearl doesn't have.