Dark feels like it's a bit torn as to whether it should be resisted by more. It has a lot of moves that have conditional damage (e.g. Pursuit, Assurance, Lash Out, Power Trip, to an extent Sucker Punch), where it makes sense to have a lot of neutral hits because they have a separate 'minigame' going on to determine if they hit hard. On the other hand, there's nothing stopping an offensive mon from just using Dark Pulse, Crunch, or a (former) signature move like Darkest Lariat or Kowtow Cleave.