Dark Supremacy
Well, first of all, sorry for the bad english, I'll try my best.
So, darkness is my favorite pokémon type. Since GSC, I tried to make a good team, but never made it. With the 5th Gen pokémon, it was easier. And with the team creation training I've made with a Sandstorm team, I finally moved to Darkness pokémon. All of these pokémon got tested and this team worked great! Well, there is my list:
Scrafty (M) @ Focus Sash
Ability - Moxie / Jolly Nature (+ Spd / - Sp. Atk)
EV's: 152 HP / 104 Atk / 252 Spd
~ Dragon Dance
~ Drain Punch
~ Crunch
~ Stone Edge
A good Lead, as I've tested. The high defenses assures a turn for the Dragon Dance setup, giving some guarantee with Focus Sash. With the speed in 354, It'll attack faster than the most leads in game. If necessary and possible, use 2 Dragon Dances and make speed reach 472. With the attack boost, OHKO is possible, and with Moxie, Scrafty will get more and more destructive.
Weavile (M) @ Life Orb
Ability - Pressure / Jolly Nature (+ Spd / - Sp. Atk)
EV's: 40 HP / 252 Atk / 216 Spd
~ Night Slash
~ Ice Punch
~ Low Kick
~ Ice Shard
Not so much to talk about it. Is the suggestion ThePillsburyDoughBoy made to me. With great speed, Night Slash and Ice Punch for sweeping, Ice Shard as the priority move, in case of a faster pokémon and Low Kick to bring Terrakion and other heavy pokémon to death.
Sableye (F) @ Leftovers
Ability - Prankster / Calm Nature (+ Sp. Def / - Atk)
EV's: 252 HP / 176 Defense / 80 Sp. Def
~ Will-O-Wisp
~ Taunt
~ Recover
~ Night Shade
Sableye is the best Stall in game. no weakness, 3 immunities, but just 1 resistance. Prankster gives priority to 3 of it's moves. Will-O-Wisp cuts attack and gives damage with the burn status. Taunt blocks settupers, Recover gives a quick heal and Night Shade to assure 100 damage, except in Normal-type pokémon. It's a bit annoying
Hydreigon (M) @ Choice Scarf
Ability - Levitate / Modest Nature (+ Sp. Atk / - Atk)
EV's: 4 HP / 252 Sp. Atk / 252 Spd
~ Dragon Pulse
~ Dark Pulse
~ Flamethrower
~ Surf
The Special Sweeper. Don't have much thing to explain about it. STABbed Dragon Pulse (or Draco Meteor) and Dark Pulse (which gives flinch), Flamethrower for some annoying ice pokémon and Surf some ground / rock / fire pokémon.
Drapion (M) @ Black Sludge
Ability - Sniper / Jolly Nature (+ Spd / - Sp. Atk)
EV's: 4 HP / 252 Atk / 252 Spd
~ Swords Dance
~ Ice Fang
~ Earthquake
~ Night Slash
As I realized Drapion don't have Fighting weakness, I put it on the team. The basic build, I guess. Swords Dance and Attack reach 558. Night Slash, with a great chance of critical hit, would give massive damage combined with Sniper. Ice Fang for dealing with dragons and Flying pokémon, or even with ground pokémon, it's weakness. And with Earthquake to sweep some other, I think this is a good choice.
Mandibuzz (F) @ Quick Claw
Ability - Overcoat / Careful Nature (+ SP. Def / - Sp. Atk)
EV's: 252 HP / 104 Def / 152 Sp. Def
~ Roost
~ Brave Bird
~ Toxic
~ Taunt
It's the wall of the team, high defenses, using toxic to cause poison, damaging to death, Brave Bird is the only physical attack in case of an opposing Taunt, Roost for healing and Taunt to annoy some boring settupers. The combination of types is good against Fighting pokémon, the team's worst weakness.
Well, this is my team. I hope you like it. =D