Surprised no one has mentioned Jolteon, especially since it's got some new moves in BW
Type: Electric
Abilities:
1)Volt Absorb: Heals HP when hit by an electric attack
2)Quick Feet: Speed increases by 50% when afflicted by a status condition (Paralysis speed drop is nullified)
Moves:
Level up:
Lv1: Tail Whip
Lv1: Tackle
Lv1: Helping Hand
Lv8: Sand-Attack
Lv15: ThunderShock
Lv22: Quick Attack
Lv29: Double Kick
Lv36: Pin Missile
Lv43: Thunder Fang
Lv50: Last Resort
Lv57: Thunder Wave
Lv64: Agility
Lv71: Thunder
Lv78: Discharge
Egg Moves:
Charm
Flail
Endure
Curse
Tickle
Wish
Yawn
Fake Tears
Covet
Detect
Natural Gift
[M500]Assist Power
[M485]Synchro Noise
TM Moves:
TM05 - Roar
TM06 - Toxic
TM10 - Hidden Power
TM11 - Sunny Day
TM15 - Hyper Beam
TM16 - Light Screen
TM17 - Protect
TM18 - Rain Dance
TM21 - Frustration
TM24 - Thunderbolt
TM25 - Thunder
TM27 - Return
TM28 - Dig
TM30 - Shadow Ball
TM32 - Double Team
TM42 - Facade
TM44 - Rest
TM45 - Attract
TM48 - Troll
TM49 - Echo Voice
TM57 - Charge Beam
TM67 - Get Even
TM68 - Giga Impact
TM70 - Flash
TM72 - Volt Charge
TM73 - Thunder Wave
TM83 - Cheer Up
TM87 - Swagger
TM90 - Substitute
TM93 - Wild Bolt
TM94 - Rock Smash
HM04 - Strength
Pre Evo Moves:
Growl
Bite
Baton Pass
Take Down
Trump Card
Hey!! It didn't get a lot if changes... except for 2 notable moves. Mainly Volt Change, Cheer Up, and this opens up some new options for Jolteon, since now it can scout and boost it's special attack. And even though quick feet is a bit meh on Jolteon, it can be used to protect from status and give it an edge on scarf users.
Happy Jolteon @ Life Orb
Timid
Volt Absorb/Quick Feet
4HP, 252 Sp. Atk, 252 Speed
Moves: Thunderbolt, HP Ice, Shadow Ball/Baton Pass, Cheer Up
I have a feeling this will be the new Standard for Jolteon. TBolt and HP Ice for Pseudo Bolt Beam, Cheer up to boost special attack, and either Shadow Ball for coverage or Baton Pass to give your boosts to a different Pokemon.
Scout Jolteon @ Burn/Toxic Orb
Timid/Modest
Quick Feet
EVs; 4 HP, 252 Sp. Atk, 252 Speed (Could be a better spread but I'm just lazy atm)
Moves; Volt Change, TBolt, Hidden power/Shadow Ball/Twave/Protect, Hidden power/Shadow Ball/Twave/Protect
A new set that can utilize Jolteon's new scouting capabilities. Quick Feet is recommended over Volt Absorb in case something tries to Paralyze Jolteon, and after Quick Feet kicks in, it can basically outspeed some scarf users. Volt Change is the main player here for obvious reasons, same goes for TBolt and HP and Shadow Ball. TWave is a option if you want to cripple some other scarf users, and Protect is an option to give yourself a chance to activate your orb item.
EDIT: Since Twave doesn't paralyze through Volt Absorb, The Scout moveset can feel free to run with Volt Absorb without fear of Twave. The rumor has been disproven in the Research Thread.
Feel free to discuss your thoughts.

Type: Electric
Abilities:
1)Volt Absorb: Heals HP when hit by an electric attack
2)Quick Feet: Speed increases by 50% when afflicted by a status condition (Paralysis speed drop is nullified)
Moves:
Level up:
Lv1: Tail Whip
Lv1: Tackle
Lv1: Helping Hand
Lv8: Sand-Attack
Lv15: ThunderShock
Lv22: Quick Attack
Lv29: Double Kick
Lv36: Pin Missile
Lv43: Thunder Fang
Lv50: Last Resort
Lv57: Thunder Wave
Lv64: Agility
Lv71: Thunder
Lv78: Discharge
Egg Moves:
Charm
Flail
Endure
Curse
Tickle
Wish
Yawn
Fake Tears
Covet
Detect
Natural Gift
[M500]Assist Power
[M485]Synchro Noise
TM Moves:
TM05 - Roar
TM06 - Toxic
TM10 - Hidden Power
TM11 - Sunny Day
TM15 - Hyper Beam
TM16 - Light Screen
TM17 - Protect
TM18 - Rain Dance
TM21 - Frustration
TM24 - Thunderbolt
TM25 - Thunder
TM27 - Return
TM28 - Dig
TM30 - Shadow Ball
TM32 - Double Team
TM42 - Facade
TM44 - Rest
TM45 - Attract
TM48 - Troll
TM49 - Echo Voice
TM57 - Charge Beam
TM67 - Get Even
TM68 - Giga Impact
TM70 - Flash
TM72 - Volt Charge
TM73 - Thunder Wave
TM83 - Cheer Up
TM87 - Swagger
TM90 - Substitute
TM93 - Wild Bolt
TM94 - Rock Smash
HM04 - Strength
Pre Evo Moves:
Growl
Bite
Baton Pass
Take Down
Trump Card
Hey!! It didn't get a lot if changes... except for 2 notable moves. Mainly Volt Change, Cheer Up, and this opens up some new options for Jolteon, since now it can scout and boost it's special attack. And even though quick feet is a bit meh on Jolteon, it can be used to protect from status and give it an edge on scarf users.
Happy Jolteon @ Life Orb
Timid
Volt Absorb/Quick Feet
4HP, 252 Sp. Atk, 252 Speed
Moves: Thunderbolt, HP Ice, Shadow Ball/Baton Pass, Cheer Up
I have a feeling this will be the new Standard for Jolteon. TBolt and HP Ice for Pseudo Bolt Beam, Cheer up to boost special attack, and either Shadow Ball for coverage or Baton Pass to give your boosts to a different Pokemon.
Scout Jolteon @ Burn/Toxic Orb
Timid/Modest
Quick Feet
EVs; 4 HP, 252 Sp. Atk, 252 Speed (Could be a better spread but I'm just lazy atm)
Moves; Volt Change, TBolt, Hidden power/Shadow Ball/Twave/Protect, Hidden power/Shadow Ball/Twave/Protect
A new set that can utilize Jolteon's new scouting capabilities. Quick Feet is recommended over Volt Absorb in case something tries to Paralyze Jolteon, and after Quick Feet kicks in, it can basically outspeed some scarf users. Volt Change is the main player here for obvious reasons, same goes for TBolt and HP and Shadow Ball. TWave is a option if you want to cripple some other scarf users, and Protect is an option to give yourself a chance to activate your orb item.
EDIT: Since Twave doesn't paralyze through Volt Absorb, The Scout moveset can feel free to run with Volt Absorb without fear of Twave. The rumor has been disproven in the Research Thread.
Feel free to discuss your thoughts.