Fighting and Ground type moves are most effective against dialga, since it is a dragon+steel type pokemon.
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you can look on this Pokemon site: scroll down, and you see: there are dialga's moves. good luck
doesn't matter, the only difference is the rare Pokemon (palkia for pearl and dialga for diamond) and you can only get stunky on diamond not pearl and you can only get Scorpio on pearl not diamond. Other than that they are both the same and both as good. hope i helped!
Well, in Diamond and Pearl you get the same Pokemon, (besides Dialga and Palkia) but in Platinum, It's a whole new world!!!!You can get Electabuzz in Sunnyshore! Without the National Dex!And It's not RARE!!!!!!! Go out and find all sorts of Pokemon in Platinum!!!!GOOD LUCK DUDE, AND OF COURSE PKMN FANS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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.
Arceous is the best Pokemon! You will find him in Lv.80 on some place were you find Dialga and Palkia but this time you climb stairs and you fine Arceous... well that's my best hope it help