Now that we know the results of the M-Sableye/Shadow Tag suspect, I wanted to make some nominations to get conversation going and to get this thread updated a bit.
Choice Scarf Excadrill: B+ -> A-
I used this for my suspect team, and though M-Eye will be staying in the tier, I think this set still warrants a raise. It has some decent advantages over other scarf ground types. First, its typing lets it switch into electrics much more easily, so it can stop volt switch more effectively. Second, Mold Breaker EQ is a crazy advantage cause you can fire off powerful EQs with little drawback - especially because there aren't many flying types that like switching into IH or Rock Slide. Finally, the fast rapid spin is quite useful for offensive teams, even if it can't spin against stall.
Calm Mind Keldeo: A+ -> A
I think the fact that this set has seen a rather large drop in usage is indicative of its deserving a drop in rank as well. It just finds itself as a jack of all trades, master of none. Specs is way more threatening as it has very few switchins with the right coverage move. Scarf has speed to pressure offense. RestTalk has longevity with the option of even running LO for a boost in power. CM Keld struggles because most teams will pack something that can switch into its STAB, so it has a hard time setting up most of the time and would rather just fire off attacks.
Landorus-Therian: Offensive SR < Defensive SR
The defensive SR sets just offer a lot more in terms of splashability and utility. The defensive investment is also hugely important for checking threats like Talonflame and Char-X. Finally, the offensive set can have some issues as its rather slow for an offensive mon. TBH, I would rather just run SD on the defensive set.
SpDef Hippowdon: A- -> B+
In terms of efficiency, this set just doesn't cut it. The mixed spread is just a lot better at handling threats in this meta, and the spdef set doesn't really change what beats the fat hippo.
Choice Band Tyranitar: A- -> A
I've used this some recently, and I really liked it. It has an incredible amount of power and can just destroy slower teams. It also still has really nice bulk with sand and its typing is quite useful in checking los birds.
Okay, so that's that. Now, on to some sets that I think should be removed. Not really gonna explain these, but in general they're either inefficient, non-influential, or just plain bad.
Remove: AV Hoopa-U, AV Kyurem-B, Dual Screens Klefki, Scarf Diggersby, Gothitelle n_n, Scarf Togekiss, Specs Dragalge