At first, I thought this was just a temporary glitch and when I tried to evolve a murkrow as well and it didn't work, I chalked it up to being a problem with the server. However, I recently started a singleplayer game (still with the most recent version of 5.0.0) and when I tried to evolve my misdreavus, which the wiki also says needs a dusk stone, it also did not evolve. I went into creative mode and tried it with the final dusk stone pokemon, lampent, and it still didn't evolve.
Is there a solution for this? Checking bulbapedia, it seems like this isn't just wrong info on the wiki as the dusk stone is actually used on all three of those pokemon in the games. So, is this a glitch I can fix? Did I miss another thread about this same topic? What's going on? I looked through the more recent pages of the general discussion forums and didn't see anything about this particular topic.