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You would have to listen to Kamelot to know how this works fully. But they are far most known for their power metal songs. Thus the Dark pokemon.
But they do have a sense of class and serenity in some of their songs. (particularly the ones with the female vocal) So aside from Hydreigon, they are represented by the ice type like Froslass, and/or are more majestic being Mega Absol.
And of course Glalie and Weavile being the fusion of both styles that they incorporate so well into their music.