I agree with Super Mario Bro. Landorus is probably the best offensive tank in OU, and it just brings so many things to the table for offensive and balanced teams. SR, Intimidate, valuable resistances, powerful U-turn, and great coverage with the EdgeQuake combo all make it a very versatile threat. And of 'course being one of the best checks to Terrakion, aka one of the few S Rank Pokemon, is a huge boon as well.
Double Dance Lando-T is very legit as well, and the choiced sets work ok too, adding a bit of versatility to Lando-T. I think it should be in A rank too!
Part of the OU QC team, message
me for a check!