Forum Announcement: The Ultimate Competitive Compendium
@Black117, @Squeab, @"Elly", @Rogue, and I have been working very hard to build the ultimate competitive resource for you all. Here you will be able to find all of the best competitive resources that we have to offer in one happy place. Please note that this project is continually ongoing and more guides will be added as they are written.

This post was last updated on 22 October 2016.

Essentials: General Competitive:
General Competitive Movesets:
Smogon/Singles/OU Doubles:
Outdated, honorable mentions until the guides are rewritten: