Palkia and Giritina can learn dragon claw.
Dialga is a Steel-type and a Dragon-type.
They are both good but.... i have Pearl and my friend has Diamond. He says Diamond is better becuase, Dialga is Steel and Dragon which is stronger than Water and Dragon for Palkia. so i guess Diamond is a little better than Pearl. But pearl is good too :]]Actually i did some research and Water is better then steel because Steel can mold from water. that makes Palkia better then Diagla. But Diagla is more powerful. i have Diamond and Pearl and i beat Pearl all ready im working on Diamond.
the best dragon types are rayqaza,giranita,latias,lotios,palkia,diagla,draginite.
You have to battle a legendary Dragon-Pokemon in Pearl. You will have the greatest chance by facing Giritina, Diagla, Palkia, Darghina, Charizard, or Ghalstone. (Darghina, Charizard, and Ghalstone are not legendary Dragon-Pokemon, but they will supply you with a dragon scale).
Giratina(Ghost & Dragon)
on a hill
no
dragon Pokemon are weak against ice attacks as well as dragon type attacks.
diagla is a steel dragon and palkia is a water dragon
yes
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You can only get Rayquaza in Pokemon Diamond by trading it from Ruby, Sapphire, and Emerald. The Rayquaza is a very powerful flying dragon type Pokemon.