Well, I think its obvious that Palkia looks 100X more amazing then Dialga because Dialga looks like a Giraffe. I think that is why they associated Dialga with pokemon Diamond and Palkia with pokemon Pearl. Everyone knows diamonds are better than pearls and everyone knows that Palkia looks way more amazing then Dialga, so the two games can be counterbalanced (the unintelligent choose diamond and the realists choose pearl). As far as type, I prefer Palkia, however, Dialga may have it beat with Roar of Time. But anyone who says Dialga is cooler is just saying that to defend their blunder in choosing a game based on the name and not the legendary.

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