This is a team I've been working on in my freshly bought platinum. Before I finalized anything (uggh, level 100 grind) I tested it out on shoddy for a few days to see how it plays. I'm somewhat satisfied, but I feel it could be better. I'll give more detail later on each pokemon. Without further ado, here's my team at a glance:
And here's the more detailed look:
Bronzong (Invincible)
Sassy @ Leftovers (Levitate)
252 Hp, 86 Atk, 80 Def, 92 SpD
Gyro Ball
Stealth Rock
Hypnosis
Earthquake
A basic lead Bronzong taken straight from the strategy pokedex. I actually like this guy quite a bit, despite his dropping popularity. He usually gives me enough leeway to lay down rocks and switch to heatran to absorb any fire attacks that would melt bronzong's face. He is also fun to play when I'm anticipating a taunt from crobat or aerodactyl, considering I can wipe their lead out of the game with a well-anticipated gyro ball, or two if they're rocking a focus sash. Seems to work, but I'm open to suggestions.
Scizor (Assassin)
Adamant @ Life Orb (Technician)
32 Hp, 252 Atk, 224 Spe
Swords Dance
Bullet Punch
Brick Break
X-Scissor
Delicious swords dance scizor once againly shamelessly copied from the strategy pokedex. I love this guy. I've swept a good deal of teams with him, due to the brutal consequences of letting him get off a swords dance or two. I'm always open to suggestions, but I feel this guy is probably the most solid member of my team, sans maybe heatran. (Which is probably why everyone else seems to use him; I never claimed to be original)
Heatran (Hysteria)
Naive @ Choice Scarf
4 Hp, 252 SpA, 252 Spe
Flamethrower
Earth Power
Explosion
Dragon Pulse
Heatran is fantastic. He complements scizor and bronzong extraordinarily and tears things apart. Boosted flamethrower melts faces, earth power covers a lot of flamethrowers resistences, explosion makes blissey cry, and dragon pulse takes out those dastardly dragons, including kingdra. This is a pretty over-used set, and for good reason.
Tyranitar (Dead Star)
Jolly @ Life Orb
4 Hp/252 Atk/252 Spe
Dragon Dance
Stone Edge
Fire Punch
Crunch
Standard dragon dance T-Tar. I'm really not sure about this guy on my team. He has swept a few people alone after a dragon dance, but he seems to be a liability quite a bit. For one, sand stream ruins cresselia's healing ability, which makes me want to swap out T-Tar or grab another pokemon that can take a few hits in place of cresselia. He also seems to die quite a bit. Water moves, fighting moves, and grass knot seem to run rampant in OU. I'd really appreciate some help on replacements, or a better way to set this guy up if it's worth it.
Porygon-Z (Plug In Baby)
Modest @ Choice Scarf (Download)
4 Def, 252 SpA, 252 Spe
Tri Attack
Ice Beam
Thunderbolt
Dark Pulse
I'm not sure why, but it seems very few people use the Z anymore. He really ruins a lot of pokemons' days. Not sure if I like having two choice scarfers on the same team, though. He has fantastic coverage, hits rather hard, and outspeeds all but the fastest polkamen. Infernape seems to give him trouble, but I generally just swap to cresselia who tanks it like a champ. Open to corrections/replacements, as usual.
Cresselia (Starlight)
Bold @ Leftovers
4 SpA, 252 Def, 252 Hp
Reflect
Moonlight
Ice Beam
Charge Beam
Mixed feelings on this one. On one hand, I've had him kill tons of stuff by tanking/ice beam/charge beaming them down slowly. I've even managed to blow up a blissey just by stacking 5 SpA boosts and freezing it. On the other hand, sandstorm/hail makes cres cry and I've been set up on before due to my overconfidence in charge beam or ice beam. Definitely open to suggestions here.
Note:
I haven't really found any super consistent weaknesses to this team, but I've been swept just because hypnosis missed and I got set up on as well as a few other things. It feels a tad weak to kingdra utilizing rain dance and swift swim, I suppose. I've only been playing this for a few days, so maybe some weaknesses have eluded me. Any and all criticism is welcome and I thank you in advance.
Edit: Bonus points to anyone who can identify my naming scheme!






And here's the more detailed look:

Bronzong (Invincible)
Sassy @ Leftovers (Levitate)
252 Hp, 86 Atk, 80 Def, 92 SpD
Gyro Ball
Stealth Rock
Hypnosis
Earthquake
A basic lead Bronzong taken straight from the strategy pokedex. I actually like this guy quite a bit, despite his dropping popularity. He usually gives me enough leeway to lay down rocks and switch to heatran to absorb any fire attacks that would melt bronzong's face. He is also fun to play when I'm anticipating a taunt from crobat or aerodactyl, considering I can wipe their lead out of the game with a well-anticipated gyro ball, or two if they're rocking a focus sash. Seems to work, but I'm open to suggestions.

Scizor (Assassin)
Adamant @ Life Orb (Technician)
32 Hp, 252 Atk, 224 Spe
Swords Dance
Bullet Punch
Brick Break
X-Scissor
Delicious swords dance scizor once againly shamelessly copied from the strategy pokedex. I love this guy. I've swept a good deal of teams with him, due to the brutal consequences of letting him get off a swords dance or two. I'm always open to suggestions, but I feel this guy is probably the most solid member of my team, sans maybe heatran. (Which is probably why everyone else seems to use him; I never claimed to be original)

Heatran (Hysteria)
Naive @ Choice Scarf
4 Hp, 252 SpA, 252 Spe
Flamethrower
Earth Power
Explosion
Dragon Pulse
Heatran is fantastic. He complements scizor and bronzong extraordinarily and tears things apart. Boosted flamethrower melts faces, earth power covers a lot of flamethrowers resistences, explosion makes blissey cry, and dragon pulse takes out those dastardly dragons, including kingdra. This is a pretty over-used set, and for good reason.

Tyranitar (Dead Star)
Jolly @ Life Orb
4 Hp/252 Atk/252 Spe
Dragon Dance
Stone Edge
Fire Punch
Crunch
Standard dragon dance T-Tar. I'm really not sure about this guy on my team. He has swept a few people alone after a dragon dance, but he seems to be a liability quite a bit. For one, sand stream ruins cresselia's healing ability, which makes me want to swap out T-Tar or grab another pokemon that can take a few hits in place of cresselia. He also seems to die quite a bit. Water moves, fighting moves, and grass knot seem to run rampant in OU. I'd really appreciate some help on replacements, or a better way to set this guy up if it's worth it.

Porygon-Z (Plug In Baby)
Modest @ Choice Scarf (Download)
4 Def, 252 SpA, 252 Spe
Tri Attack
Ice Beam
Thunderbolt
Dark Pulse
I'm not sure why, but it seems very few people use the Z anymore. He really ruins a lot of pokemons' days. Not sure if I like having two choice scarfers on the same team, though. He has fantastic coverage, hits rather hard, and outspeeds all but the fastest polkamen. Infernape seems to give him trouble, but I generally just swap to cresselia who tanks it like a champ. Open to corrections/replacements, as usual.

Cresselia (Starlight)
Bold @ Leftovers
4 SpA, 252 Def, 252 Hp
Reflect
Moonlight
Ice Beam
Charge Beam
Mixed feelings on this one. On one hand, I've had him kill tons of stuff by tanking/ice beam/charge beaming them down slowly. I've even managed to blow up a blissey just by stacking 5 SpA boosts and freezing it. On the other hand, sandstorm/hail makes cres cry and I've been set up on before due to my overconfidence in charge beam or ice beam. Definitely open to suggestions here.
Note:
I haven't really found any super consistent weaknesses to this team, but I've been swept just because hypnosis missed and I got set up on as well as a few other things. It feels a tad weak to kingdra utilizing rain dance and swift swim, I suppose. I've only been playing this for a few days, so maybe some weaknesses have eluded me. Any and all criticism is welcome and I thank you in advance.
Edit: Bonus points to anyone who can identify my naming scheme!