Like the Generation IV games, Black & White include a variety of Wi-Fi events that give you access to special places and Pokémon. this page is to detail all of these events

Liberty Pass
Release Dates:

Japan: September 18th 2010 to October 18th 2010
America: March 6th 2011 to April 10th 2011
Europe: March 4th 2011 to April 22nd 2011

Gift:
Liberty Pass

Use:
The first WiFi Event in Pokémon Black & White gives you the special item, the Liberty Pass. This ticket will give you access to a special area in Unova where you will find the Pokémon Victini in the wild. This allows you to capture Victini and is the only way to obtain it.

Cubchoo
Release Dates:

Japan: October 22nd 2010 to November 29th 2010
America: ??
Europe: ??

Gift:
Pokémon - Cubchoo

Use:
The second WiFi Event in Pokémon Black & White gives you the rare Pokémon; Cubchoo. This Pokémon is not findable easily outside of Winter and so is beign given away over WiFi to allow everyone to get it. It is currently unknown if it has any special moves.

クマシュン /
Level 15
OT:ポケスマ
ID:10220
Ability:Snow Cloak
Hold Item:

Max Potion
Any Nature.
Date of Receiving
Lovely Place. Apparently had a fateful encounter at Lv. 15
Powder Snow
Growl
Bide
Icy Wind
Mystery Egg
Release Dates:

Japan: December 17th 2010 to January 11th 2010
America: ??
Europe: ??

Gift:
Egg - Pidove/Pansage/Axew

Use:
The third WiFi Event in Pokémon Black & White gives you an Egg. There are three possible Pokémon that you can obtain from the egg, based upon several Pokémon owned by the main characters of the anime. You get the Pokémon chosen at random so you can't select the Pokémon you receive. These Pokémon, based upon the Pidove, Pansage & Axew of Ash, Cilan & Iris respectively, have maximum IVs in Attack, Special Attack & Speed and natures that match

マメパト
Level 1
OT:Yours
ID:Yours
Ability:Super Luck
Hold Item:
No Item
Hardy Nature.
Egg Received Date of Receiving
Event. Hatched at Location
Gust
Quick Attack
Air Cutter
 
 
This Pokémon comes within an Egg and requires hatching

ヤナップ
Level 1
OT:Yours
ID:Yours
Ability:Gluttony
Hold Item:
No Item
Brave Nature.
Egg Received Date of Receiving
Event. Hatched at Location
Bullet Seed
Bite
Solarbeam
Dig
 
This Pokémon comes within an Egg and requires hatching

キバゴ
Level 1
OT:Yours
ID:Yours
Ability:Mold Breaker
Hold Item:
No Item
Naive Nature.
Egg Received Date of Receiving
Event. Hatched at Location
Scratch
Dragon Rage
 
 
 
This Pokémon comes within an Egg and requires hatching

Ash's Scraggy
Release Dates:

Japan: January 28th 2011 to February 10th 2011
America: ??
Europe: ??

Gift:
Pokémon - Scraggy

Use:
The fourth WiFi Event in Pokémon Black & White gives you the Pokémon Scraggy, based upon Ash's Scraggy in the anime.

ズルッグ
Level 1
OT:サトシ
ID:01281
Ability:Moxie
Hold Item:

Muscle Band
Adamant Nature.
Date of Receiving
Pokémon Event. Apparently had a fateful encounter at Lv. 1
Headbutt
Leer
Hi Jump Kick
Low Kick
Zoroark
Release Dates:

Japan: February 15th 2011 - March 14th 2011
America: ??
Europe: ??

Gift:
Pokémon - Zoroark

Use:
The fifth WiFi Event in Pokémon Black & White gives you the rare Pokémon; Zoroark. This Pokémon is not findable easily within the games. However, this Zoroark is given the special move, Snarl, not knowable by any other Pokémon at time of delivery.

ゾロアーク
Level 50
OT:ポケスマ!
ID:01161
Ability:Illusion
Hold Item:
No Item
Quirky Nature.
Date of Receiving
Pokémon Event. Apparently had a fateful encounter at Lv. 50
Agility
Embargo
Punishment
Snarl
Carita's Hydreigon & Janta's Golurk
Release Dates:

Japan: July 8th 2011 - September 8th 2011
America: ??
Europe: ??

Gift:
Pokémon - Hydreigon/Golurk

Use:
The sixth WiFi Event in Pokémon Black & White have a difference depending upon the version. f you have Pokémon Black, you can download a Shiny Hydreigon based on Carita's Hydreigon in Victini & The Black Hero: Zekrom and if you have Pokémon White, you can download a Shiny Golurk based upon Janta's Golurk in Victini & The White Hero Reshiram..

サザンドラ
Level 70
OT:カリータ
ID:06171
Ability:Levitate
Hold Item:
No Item
Any Nature.
Date of Receiving
Pokémon Movie 11. Apparently had a fateful encounter at Lv. 70
Hyper Voice
Dragonbreath
Flamethrower
Focus Blast
Games Available Black
ゴルーグ
Level 70
OT:ジャンタ
ID:06171
Ability:Iron Fist
Hold Item:
No Item
Any Nature.
Date of Receiving
Pokémon Movie 11. Apparently had a fateful encounter at Lv. 70
Shadow Punch
Hyper Beam
Gyro Ball
Hammer Arm
Games Available White

First Anniversary Mewtwo
Release Dates:

Japan: September 26th 2011 - October 31st 2011
America: February 11th 2012 - February 26th 2012
Europe: February 11th 2012 - February 26th 2012 (English Language)

Gift:
Pokémon - Mewtwo

Use:
The seventh WiFi Event in Pokémon Black & White is to celebrate the first anniversary of Pokémon Black & White and offers the strongest Pokémon; Mewtwo.

ミュウツー
Level 70
OT:ポケスマ!
FEB2012
ID:09261
02112
Ability:Pressure
Hold Item:

King's Rock
Any Nature.
Date of Receiving
Pokémon Event. Apparently had a fateful encounter at Lv. 70
Psystrike
Shadow Ball
Aura Sphere
Electro Ball
Movie Victini
Release Dates:

Japan: Not WiFI
America: December 3rd 2011 to December 31st 2011 (January 14th Actual End)
Europe: December 3rd 2011 to December 31st 2011(January 14th Actual End) (English Language Only)
Europe: April 10th 2012 to April 30th 2012(Spanish, German, Italian)
Europe: June 1st 2012 to June 30th 2012 (France) Gift:
Pokémon - Victini

Use:
The second American WiFi Event in Pokémon Black & White is to celebrate the release of the two movies; Black: Victini & Reshiram and White: Victini & Zekrom. It gives Victini with the special move V-Create and Reshiram & Zekrom's special moves

Victini
Level 50
OT:Movie14
ID:12031
Ability:Victory Star
Hold Item:

Fire Gem
Any Nature.
Date of Receiving
Wi-Fi Gift. Apparently had a fateful encounter at Lv. 50
V-create
Fusion Flare
Fusion Bolt
Searing Shot
Tornadus & Thundurus
Release Dates:

Japan: December 16th 2011 to January 10th 2012
America: ??
Europe: ??

Gift:
Pokémon - Tornadus & Thundurus

Use:
The eighth Japanese WiFi Event in Pokémon Black & White is to celebrate the airing of two special episodes of the anime featuring the battle between Tornadus, Thundurus and Landorus. The gifts provide Thundurus for Black and Tornadus for White, allowing you to get Landorus with these gifts and the Pokémon from the game

トルネロス
Level 70
OT:ミロスとう
ID:12161
Ability:Prankster
Hold Item:

Revival Herb
Any Nature.
Date of Receiving
Pokémon Event. Apparently had a fateful encounter at Lv. 70
Hurricane
Hammer Arm
Air Slash
Hidden Power
Games Available White

ボルトロス
Level 70
OT:ミロスとう
ID:12161
Ability:Prankster
Hold Item:

Revival Herb
Any Nature.
Date of Receiving
Pokémon Event. Apparently had a fateful encounter at Lv. 70
Thunder
Hammer Arm
Focus Blast
Wild Charge
Games Available Black

Zekrom/Reshiram
Release Dates:

Japan: Not WiFi
America: March 10th 2012 - April 8th 2012
Europe: March 10th 2012 - April 8th 2012

Gift:
Pokémon - Reshiram/Zekrom

Use:
The fourth non-Japanese WiFi Event in Pokémon Black & White features the legendary Pokémon Reshiram & Zekrom. This giveaway gives you the legendary dragon that was not found within your game. They have exclusive moves of Mist and Haze. They access special C-Gear skins in the Global Link

Reshiram
Level 100
OT:SPR2012
ID:03102
Ability:Turboblaze
Hold Item:

Dragon Gem
Any Nature.
Date of Receiving
Pokémon Event. Apparently had a fateful encounter at Lv. 100
Blue Flare
Fusion Flare
Mist
Draco Meteor
Games Available White

Zekrom
Level 100
OT:SPR2012
ID:03102
Ability:Teravolt
Hold Item:

Dragon Gem
Any Nature.
Date of Receiving
Pokémon Event. Apparently had a fateful encounter at Lv. 100
Bolt Strike
Fusion Bolt
Haze
Outrage
Games Available Black

Nobunaga's Rayquaza
Release Dates:

Japan: March 17th 2012 to April 16th 2012
America: ??
Europe: ??

Gift:
Pokémon - Rayquaza

Use:
The ninth Japanese WiFi Event in Pokémon Black & White ives you a special shiny Rayquaza based upon Nobunaga's Rayquaza within the game Pokémon + Nobunaga's Ambition.

レックウザ
Level 70
OT:ノブナガ
ID:03172
Ability:Air Lock
Hold Item:
No Item
Any Nature.
Date of Receiving
Pokémon Event. Apparently had a fateful encounter at Lv. 70
Dragon Pulse
Ancientpower
Outrage
Dragon Dance
Darkrai
Release Dates:

Japan: ??
America: May 8th 2012 to June 10th 2012
Europe: May 8th 2012 to June 10th 2012

Gift:
Pokémon - Darkrai

Use:
The fifth non-Japanese WiFi Event in Pokémon Black & White gives you a special Darkrai, featuring the Enigma Berry, an item that is impossible to obtain outside of the Dream World.

Darkrai
Level 50
OT:2012MAY
ID:05092
Ability:Bad Dreams
Hold Item:

Enigma Berry
Any Nature.
Date of Receiving
Wi-Fi Gift. Apparently had a fateful encounter at Lv. 50
Dark Void
Ominous Wind
Faint Attack
Nightmare