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Sound (as a type for a lot of sound-based moves, Whismur family, et cetera) is an idea that I'd heard, as was Light, which would be both weak to and super effective on Dark (obviously with other stuff), and would represent the "sacred magic" cliché category rather well:
Obvious Sound moves/Pokémon: Everything in Soundproof that's normal Whismur line
Obvious Light moves/Pokémon: Arceus Judgement Sacred Fire (tough to say, because... well, it's sacred, but it's also fire)
And if they are types, there can be more, there just aren't that many yet. That didn't keep them from doing Dark and Steel though. (stares at conspicuous lack of Dark types obtainable in FRLG pre-ending)