Sorry if I am breaking the "rules" here by posting these sets, but I have no need to further test them as I have used them in the past and continued to use them effectively. Of course it is not my decision whether or not they get added, but in my opinion they are definitely worthy of being included.
Celebi @ Leftovers
Ability: Natural Cure
EVs: 252 HP/4 Def/252 SDef
Calm nature (+SDef, -Atk)
- Grass Knot
- Recover
- Thunder Wave
- Leech Seed
This Celebi set is able to counter the common scarfers, Palkia and Garchomp (though Outrage can 2HKO), along with being a great check for choice Kyogre and Groudon without Fire Punch. Being able to spread Thunder Wave without the fear of Groudon coming in is a great asset to any Uber team. Celebi, with Natural Cure, works wonders switching in on opposing status spreaders and is either able to status a pokemon or out stall with Leech Seed. Next to Bronzong, this is one of the best defensive OU pokemon.
Weavile (M) @ Focus Sash
Ability: Pressure
EVs: 4 HP/252 Atk/252 Spd
Adamant nature (+Atk, -SAtk)
- Fake Out
- Ice Shard
- Night Slash
- Brick Break
This Weavile set is a very dedicated anti-lead. With Fake Out and Ice Shard/Night Slash, it is guaranteed that opposing Deoxys will only be able to set up Stealth Rock or 1 layer of spikes maximum. Brick Break is for the extremely common and frustrating Dual Screen teams, who find that they will be unable to BP with Mew with Weavile hitting it for super effective damage without screens. Weavile can also be used later in the match to revenge common threats such as RP Groudon and Rayquaza.
Weavile (M) @ Choice Band
Ability: Pressure
EVs: 4 HP/252 Atk/252 Spd
Jolly nature (+Spd, -SAtk)
- Night Slash
- Pursuit
- Ice Punch
- Ice Shard
Weavile, in my opinion, is very outclassed as a sweeper. However, no Pokemon is better in the revenge role than the Pokemon who has the best Stab combination in Ubers. Pursuit ruins the Lati twins; Ice Shard catches Rayquaza, Rock Polish Groudon, and Deoxys; and Ice Punch powers itself past the common Uber Walls of Groudon, Lugia, and Giratina, who are all 2HKO'ed with SR up (Giratina has a 39% to live with Max/Max). Even those such as Kyogre and Dialga are 2HKO'ed by Night Slash/Ice Punch respectively. Weavile creates many match up problems for the opponent.
Bronzong @ Leftovers
Ability: Levitate
EVs: 252 HP/56 Def/200 SDef
Sassy nature (+SDef, -Spd)
- Gyro Ball
- Grass Knot
- Hypnosis
- Stealth Rock
*Explosion can be added over any of the 4 moves.
Although Bronzong lacks a recovery move like Celebi, it does add the steel typing and a handful of resistances that come with it. Although it can not handle Kyogre, it still handles Groudon and Garchomp well. It also has the benefit of being able to hurt Darkrai, Rayquaza, and Kyogre (sometimes Groudon) switch ins who are not expecting an attacking move. Although Hypnosis is slightly unreliable, an opponent's slept Kyogre can benefit the team greatly.
Although I will not post sets for them, Roserade as a lead, Band Heracross, Cleric Blissey, and Anti-Lead Scizor are also very viable.