Ok here is my second Speed freak team.

Item: Leftovers
Ability: Contrary
Nature: Timid
EVs: 252 S.Attack, 252 Speed, 6 Hp
Taunt: Stop
Leaf-storm: STAB+Boosting
Hidden-power(Fire): Coverage
Dragon-pulse: Coverage
Serperior boasts the unique Speed stat of 113 making him a speed freak for sure! He is a great sweeper and he can stop Boosters and set up leads in their tracks with Taunt.

Item: Focus-sash
Ability: Steadfast or Justified?
Nature: Jolly
EVs: 252 Attack, 252 Speed, 6 Hp
Swords-dance: Boosting
Bullet-punch: STAB+Priority
Drain-punch: STAB + Healing
Earthquake: Coverage
While not exactly a speed freak with only 90 Speed, he gets Bullet-punch for strong priority.

Item: Leftovers
Ability: Natural-cure
Nature: Timid
EVs: 200 S.Attack, 58 Hp, 252 Speed
Scald: STAB and Burn
Rapid-spin: Spinner
Ice-beam: Coverage
Thunder-bolt: Coverage
115 Speed makes Starmie tied for fasted un-boosted Water type. Josh suggested a more bulky version, but I am not sure, this one has served me quite well so far.

Item: Flying-gem
Ability: Inner-focus or Infiltrator?
Nature: Jolly
EVs: 252 Attack, 252 Speed, 6 Defense
Acrobatics: STAB
U-turn: Coverage+switch
Super-fang: Wall-breaking
Confuse-ray: Confusion
130 Speed is makes Crobat one of the fastest Pokemon in the game. This is one of my favorite Pokemon to use, his Acrobatics hits everything that is not resistant to it extremely hard, I have almost OHKOed Swampert with it (no flying gem boost that time). I used to have Steel-wing but I have found Super-fang more useful, because just when they switch in a super bulky Pokemon I cut its HP in half then escape with U-turn.

Item: Focus-sash
Ability: Volt-absorb or Quick-feet?
Nature: Timid
EVs: 252 S.Attack, 252 Speed, 6 Hp
Thunder-wave: Status
Volt-switch: STAB and Switch
Hidden-power(Ice): Coverage
Shadow-ball: Coverage
Again 130 Speed stat, he has the quickest T-wave in the game aside from Deoxys and Electrode. I have used this guy a lot, I usually use Volt-absorb however Quick-feet could be useful, though Jolteon rarely gets a status and Volt-absorb is always fun to make use of when people try to get my Starmie and Crobat with electric type moves.
And Finally The Pokemon You Have All Been Waiting For! The Mighty TORTERRA!

Item: Leftovers or Focus-sash?
Ability: Overgrow
Nature: Adamant
EVs: 252 Attack, 252 Speed, 6 Hp
Rock-polish: Boost that speed
Stone-edge: Coverage over ALL Weaknesses
Earthquake: STAB
Seed-bomb: STAB
My signature Torterra. Speed freak's Torterra. He has proven to be an extremely useful member of the team.