Been a while since I took part in CAP
Anyways, I would like to expand a bit on Revenankh's support movepool and give it Will-o-Wisp. If I can recall, one argument used against it was because it would be too much like Dusknoir. However, since Dusknoir has been trashed nowadays we shouldn't care about it much anymore
With Will-o-Wisp, Arghonaut can be seriously crippled as it uses physical attacks to deal damage, and it becomes less effective at taking hits. Fidgit also doesn't like being burned all that much, given that its only recovery move is Wish. Furthermore, Will-o-Wisp can deter Calm Mind Jirachi from swapping in and wrecks Metagross, Gyarados and Salamence to an extent. You can also use it in conjunction with Taunt to beat up slower arghonaut and Gyarados. With four moves, I highly doubt it'd become broken. Also, for flavor reasons, all the other ghosts bar frosslass gets it :)
I agree with Will-o-Wisp viability, although I doubt it will be as useful as it is on Kitsunoh or Rotom. I can see some "lure" set being somewhat effective, but do not forget that Revenankh tend to draw in Special attackers much more frequently than, say, Rotom.