Empoleon is not on the list, but I'd like to make case for it (and reserve it if it gets approved). The Agility SubPetaya is amazing, after setup it's fast but more importantly very powerful. With Drizzle support, a fully setup Hydro Pump is about as powerful as a Choice Specs Kyogre's Water Spout, and can KO Blissey with Stealth Rock and one layer of Spikes. It can also run a defensive set very effectively, as its typing combined with its bulk lets it beat Lati@s and a lot of things on rain (bar Keldeo and Thundurus) easily.
Also, reserving Reuniclus if possible.