Insurgence introduced some wonderful meta-changing dynamics in the form of Deltas, new Mega Evolutions, Armored Pokemon, and other miscellaneous features.
With this, it can be hard to figure out good competitive strategies, however forum user OmegaAlpha has compiled a comprehensive tier list that I have found incredibly useful. Unfortunately the poor formatting and massive vandalism due to the document’s privacy settings make it difficult and frustrating to read
This is my re-format, with neatly listed tiers and images. All is credited to the original author, or course, but this is my addition to his efforts.