Just stating that, this was initially a Wetherless HO team, with Deoxys-D, over Garchomp. It was meant to test if a Spinblocker was required to use Weatherless HO (like Gengar) or, if it can viably preform in OU, with the risk of hazards being blown away.
The Terrakion set was what was meant to sweep, or the focus if my team, and it did its job well, whenever I needed it. It is a WallBreaker that abuses its amazing stabs and ability to grab free turns. Also, it gives all offensive teams hell, since 99.9% of them lack a sufficient switch in, that isn't outspeed and 2hkod or, almost oHkod / OHKOd when it comes in. Adamant life orb hits almost as hard as CB Terrakion, believe it or not.
However, my team is still weak to a few common threats, although it can deal with them offensively, it cannot sponge their Attaks, such as: Timid / +Speed Growth Venusuar (In Sun, obviously), Rock Polish Special Landorus (Latios isn't a great counter, especially with its switch in being predictable and HP ice easily 2HKOn), and Choice Banded Pokemon (this is very general, with good prediction, anything from Tyranitar, to Dragonite, Terrakion, Scizor, Landorus-T, Garchomp, etc. can give me hell. It is mostly a prediction game, to deal with them. It'd be the same with strong special attackers but, Dragons resist common rain teams hydros and thunders, and Magnezone tanks hurricanes (with no Torn-T, this is even easier.) Landorus being the one exception, as a special attacker.)