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Well we all know what Palkia looks like. :D
So Dialga, although I dislike both, really; space and time is too far and legendaries have since ceased to be cool... assuming they ever were after Gen I.
Traditionally, as the diluted form of red, which signifies blood and the like, it was a manly colour. I guess it became more effeminate over time as people began to see it as a wussy version of red.