Originally Posted by Fat The Knights of Wario Land
Only Thundurus-T and Landorus-T need comply, Tornadus-T isn't that good in VGC. Also watch out for older threats such as Hydreigon, Scrafty, and Conkeldurr getting a boost in usage due to new moves / abilities.
Also the new DW Ability / Move tutor combination. Plus Unova dex's tutor list.