This is for the Build team section
Revenankh
Revenankh requires very little team support, and so it can fit into a lot of teams. Offensive Teams will enjoy Revenankh's Tanking prowess, and the more special biased ones may like the ease it switches into Blissey. Stalling teams also find Revenankh's Anti-Spin typing quite useful. As such, the Fighting ghost is an asset to almost any team.
If you wish to build your team more centralized around Revenankh, however, there are some top choices. Heatran is a good all-around weapon to deal with Jirachi, Celebi and Shaymin-S. Tyranitar may help against Zapdos, Fidgit, Rotom Appliances and Cresselia. Dugtrio can trap and kill Jirachi and Metagross, bur you will hardly be able to switch into them directly. Zapdos will take care of Togekiss, Staraptor and Metagross. Finally, if you have trouble with Gyarados, Vaporeon or Porygon2 could help too.
A final note: since Revenankh requires much more dedicated revenge killers/counters than a lot of stuff out there - chances are your generic Scarfed poke will not work -, an extra effort into lure and kill the standard counters ( which will usually appear in a number of 2-3 at max per team). A surprising mixed set, the occasional Explosion/Scarf, a gimmick-albeit-useful move of sort may open the way to a clean sweep easier than many could think.
Hope this can work