
So I started playing on shoddy about a week ago and I think I finally found a team that has been winning a lot of matches. I'm using Suicune as the main sweeper. After a calm mind it can survive almost any un-boosted special attack and dish one out with a lot of power. Advice would be appreciated since I'm new to the battling scene.
Team at a glance:
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In Depth:

Timid- (Roserade) @ Focus Sash
Ability- Natural Cure
EVs- 252 Speed, 252 SpAttack, 6 Hp
-Toxic Spikes
-Sleep Powder
-Leaf Storm
-Sludge Bomb
Orginally was a Mamoswine but thanks to a rate I see that Roserade fits in much better for the team. I sleep powder any lead that is slower and then set-up Toxic spikes while they switch. Sludge Bomb is there for STAB and a powerful way to posion pokes immune to Toxic Spikes. Suicune and the rest of my team benefits greatly from having sleep and posion support. It also provides amazing status aborsbtion(Natural Cure) which would otherwise cripple Suicune.

Timid- (Magnezone) @ Leftovers
Ability- Magnet Pull
EVs: 70 Attack, 188, Speed, 252 SpAttack
-Magnet Rise
-Thunderbolt
-Hidden Power (Fire)
-Explosion
Here for one reason only, to hunt down steels. With steel being such a popular typing magnezone earns a spot on the team by being able to take down any steels in the way (especially scizor). He's running a timid nature to outspeed any non-scarfed metagross with no speed EVs. This is important because if Zone doesn't get a magnet rise up before the oncoming earthquake, it is dead. The attack EVs are there so Explosion packs a bigger punch. Speaking about that, Zone also comes in handy when an opponent puts out a poke that completly walls the team such as blissey. I weaken it with some thunderbolts and Hidden powers and then after it protects I explode hopefully killing it.

Timid- (Gengar) @ Life Orb
Ability-Levitate
EVs: 252 SpAttack, 252 Speed, 6 HP
-Shadow Ball
-Thunderbolt
-Focus Blast
-Destiny Bond
Gengar is one of the most important parts of my team. It switches in on fighting types to protect Magnezone and Tyranitar from almost certain death. Running a Timid nature brings a total 350 speed which outruns almost everthing. Focus Blast and Thunderbolt are there for type coverage and come in use when up against bulky waters or tanks. Gengar also proves his worth with the almighty Destiny Bond. When used with prediction it can completly turn aroound the whole game. Destiny Bond can ruin opponent's sweeps and make way for my suicune to set up her's.

Jolly- (Gliscor) @ Leftovers
Ability- Sand Veil
EVs: 252 Hp, 40 Defence, 216 Speed
-Earthquake
-Roost
-Taunt
-Stealth Rocks
Thanks to pkmtrainerblue for the suggestion, Gliscor fits in perfectly for my team. Immune to the electric attacks aimed at Suicune, gets an evasion boost due to sand veil, can ruin any stall team with Taunt, is able to recover Hp with roost, and finally supports the team with Stealth Rocks. Not only that but it can OHKO Lucario who is a major threat to the team. Whats not to like? I chose Jolly nature over Impish so that I can outrun and all non jolly Lucario and OHKO with Earthquake.

Adamant-Dust Bowl (Tyranitar) @ Leftovers
Ability- Sand Stream
EVs: 100 HP, 252 Attack, 152 Defence. 6 SpDefence
-Curse
-Crunch
-Stone Edge
-Brick Break
A run-off of the CurseTar, this set has proven most effective for me. Taking advantage of T-Tar's massive Base 134 Attack and 110 Defence, curse allows me to Tank through an opponents team. T-Tar also has incredible synergy with the rest of the team. It takes care of Electric,Rock, Normal, and Flying while Magnezone, Gyrados and Suicune take care of Ground, Steel, Bug, and Grass elimating eachother's weaknesses.

Modest- Waverunner (Suicune) @ Lum Berry
Ability- Pressure
EVs: 52 HP, 100 Defence, 252 SpAttack, 106 Speed
-Calm Mind
-Hidden Power (Electric)
-Surf
-Ice Beam
The star of the show Suicune! With its incredible HP, Defences, and Special Attack it fits the mold for a great sweeper. I wanted it to survive multiple attacks so 100 Defence EVs and 52 HP EVs are used at the cost of speed. After 1-2 Calm Minds she can tank through almost everything. Even if the rest of the team could not get rid of its resistences it can still continue the sweep with HP Electric and Ice Beam. I chose to use a Lum Berry over Leftovers because everytime I would set up for a sweep I would get crippled by a status.
I'm still learning so any advice is good. I will try and come up with a threat list later.