Going to highlight some threats of my own.
105/155/130/100/110/75
Swift Swim
There is another underrated rain sweeper, having a very odd rock/bug coverage, but it preforms a role similar to the one kabutops does in regular OU. It can Rapid Spin and swords dance, having amazing power behind its attacks. Its still walled by swagsire, but is quite bulky for a powerful sweeper and will have no trouble getting off a Swords Dance.
111/110/149/110/102/128
Cobalion is a great utility mon and glue for offensive teams due to its amazing 111/149/102 bulk, its great defensive typing, and unique offensive typing that allows it to hit a lot of threats. 110 attack is respectable, and with SD, Close combat will hit pretty hard. It has taunt for stallbreaking, magnet rise to get past ground types, thunder wave to paralyze opposing threats, volt switch to gain momentum, and stealth rock for stealth rock. Lots of potential with this one.
125/115/115/95/95/65
Quagsire is the one mon that will not only keep offense in check but nearly invalidate all of it as well. This thing has the bulk to wall half of the tiers physical attackers, and can do so very easily because of unaware. Its utility for stall is unmatched.
252+ Atk Life Orb Kabutops Waterfall vs. 252 HP / 252+ Def Quagsire: 133-157 (29.2 - 34.5%) -- 99.9% chance to 4HKO after Leftovers recovery
252+ Atk Life Orb Meloetta-P Close Combat vs. 252 HP / 252+ Def Quagsire: 203-239 (44.7 - 52.6%) -- guaranteed 3HKO after Leftovers recovery
Like seriously, it walls half of the tier comfortably. Its probably a bit broken inof itself, but there is no way we can ban it. Prepare your Mega Gengars, offense.
102/141/139/79/69/91
Speaking of disgusting wallbreakers, meet Tyrantrum. 91 speed is actually a decent benchmark for beating bulkmons, making a banded set pretty viable.
252+ Atk Choice Band Tyrantrum Outrage vs. 252 HP / 252+ Def Quagsire: 225-265 (49.5 - 58.3%) -- 98.8% chance to 2HKO after Stealth Rock and Leftovers recovery
YAY! lol. This is a very powerful wallbreaker that can actually 2hko swagsire, a very significant benchmark for offense. Watch out for Head Smash's accuracy.
130/143/85/120/85/85
Another very powerful wallbreaker for offense, unfortunately getting worn down very quickly, is emboar. Reckless Life Orb attacks hit incredibly hard, and its respectable 120 special attack and grass knot allow it to bypass quagsire and rhydon as they switch in.
80/90/125/150/100/100
Magnet pull is a great utility for offense, and Magneton pulls off the role incredibly well. With base 150 attack, it utterly obliterates a ton of common walls and more than pulls its weight when the opponent isn't carrying steel types. Its great 80/125/100 bulk and unique typing allow it to check tons of things for offense despite its common weaknesses, so this is a very useful mon for offense.
Mesprit: 110/135/135/135/135/110
UTILITY. Its got great bulk, respectable attacking stats, but most notably, an extremely deep support movepool with gems such as healing wish, stealth rock, taunt, screens, and much more. Another wonderful glue for HO teams.
105/155/105/60/105/115
Another great wallbreaker with disgusting power. Nothing commonly run on stall walls this easily, close combat destroying many of the major walls. Banded sets are by far the best and are extremely hard for all playstyles to handle, as a result this is a premiere wallbreaker on offense.
100/140/110/85/110/135
What will be one of the most efficient setup sweepers in the meta. Its good 100/110/110 bulk becomes extreme when eviolite is equipped, and its access to reliable recovery and swords dance will make it a great setup mon for offense. Its base 135 speed outpaces the majority of the metagame, and technician boosted +2 aerial aces will destroy a good portion of the metagame. These make it a great offensive cleaner.
108/100/91/80/91/130
Packing respectable 108/91/91 bulk which allows it to belly drum easily, this is a terrifying sweeper, especially for offense, due to its base 100 attack, belly drum, and extreme speed. It has seed bomb for quagsire and rhydon and shadow claw for ghosts which is really all it needs. Needs to be tested, but I have a feeling this thing will be pretty terrifying.