>>27902457Of Dark alone or of all Pokemon in general?
Mawile's in my number one spot for all Pokemon. Steel's my favourite typing, with Dark, Fairy, Ghost, and Grass taking up the rest of the top five just after Steel. Out of Dark types though my trainer card says it all. Bisharp's probably my favourite on account of also being a Steel type, and the fact it's a noble knight with a more menacing twist. Hydreigon's pretty fantastic too, although I can't quite put my finger on why I prefer it over other dragons. Mightyena mixes in elements of hyenas with what would be an otherwise generic wolf which I liked, and I always imagined it to be protective but really just a big softy, rather than just inherently violent and evil. which always seems like a poor attempt to make something threatening and scary.
Pic partially related, a gym leader I made for one of those "make your own gym leader" threads we have here every so often. I hindsight I would probably swap out Malamar and Zoroark, but restricting myself purely to Dark types limited my options.