As a concept introduced within the Pokémon Global Link in Pokémon Black & White, X & Y continues the a new method of getting events, the serial code. Here, you get given a unique serial code within certain events or releases. When you enter the Serial Code, you're connected to the Internet to download the event. The serial code will then no longer work.

Quick Ball
Release Dates:

Japan: October 12th 2013
England: October 12th 2013

Gift:
12 Quick Balls

Method:
In Japan, you could receive the Serial Code for the 12 Quick Balls for purchasing the game at the Pokémon Centers across Japan
In the United Kingdom, you can receive the Serial Code for the Quick Balls by purchasing a marked copy of Pokémon X & Y from the Tesco supermarket.

CoroCoro Garchomp
Release Dates:

Japan: November 15th 2013 - August 29th 2014

Gift:
Garchomp

Method:
In Japan, within the CoroCoro issue released on November 15th 2013, there is a special unique Serial Code that, once entered, gives a download of a special Garchomp. This download will only be accessible until the end of August 2014

ガブリアス
Level 48
OT:コロコロ
ID:11153
Ability:Sand Veil
Hold Item:

Dragon Fang
Any Nature.
Date of Receiving
Pokémon Event. Apparently had a fateful encounter at Lv. 48
Draco Meteor
Dragon Claw
Dig
Crunch
Walmart Garchomp & Scizor
Release Dates:

North America: November 27th 2013 - June 30th 2014

Gift:
Garchomp (X), Scizor (Y)

Method:
In North America, various Wal-Mart stores are including a special serial code for Garchomp in new Pokémon X copies and Scizor in new Pokémon Y copies.

Garchomp
Level 50
OT:WINTER2013
ID:11153
Ability:Sand Veil
Hold Item:

Dragon Fang
Any Nature.
Date of Receiving
A lovely place. Apparently had a fateful encounter at Lv. 50
Slash
Dragon Claw
Dig
Crunch
Scizor
Level 50
OT:WINTER2013
ID:11153
Ability:Swarm or Technician
Hold Item:

Silver Powder
Any Nature.
Date of Receiving
A lovely place. Apparently had a fateful encounter at Lv. 50
X-scissor
Night Slash
Double Hit
Iron Head
Lucky Egg
Release Dates:

Japan: December 21st 2013 - December 26th

Gift:
1 Lucky Egg

Method:
In Japan, you could receive the Serial Code for the Lucky Egg at the Pokémon Centers across Japan, as well as Toys 'R' Us stores, if you brought a copy of Pokémon Black, White, Black 2 or White 2 to the event as well as Pokémon X or Y

CoroCoro Charizard
Release Dates:

Japan: March 15th 2014 - August 29th 2014

Gift:
Charizard with Charizardite Y (X), Charizard with Charizardite X (Y)

Method:
In Japan, the magazine CoroCoro's April issue contains a special serial code which gives played a Charizard. The Charizard comes holding the Mega Stone for Charizard that is unavailable in the game, so Pokémon X players get Charizardite Y and Pokémon Y players get Charizardite X.

リザードン
Level 36
OT:コロコロ
ID:03154
Ability:Blaze
Hold Item:

Charizardite X
Any Nature.
Date of Receiving
A lovely place. Apparently had a fateful encounter at Lv. 36
Dragon Rage
Fire Fang
Air Slash
Dragon Claw

リザードン
Level 36
OT:コロコロ
ID:03154
Ability:Blaze
Hold Item:

Charizardite Y
Any Nature.
Date of Receiving
A lovely place. Apparently had a fateful encounter at Lv. 36
Fire Fang
Flamethrower
Air Slash
Inferno
GAME Electabuzz & Magmar
Release Dates:

United Kingdom: April 4th 2014 - ??
France, Germany, Italy: April 14th 2014 - ??
Netherlands: April 14th 2014 - April 30th 2014
Spain, Portugal: April 14th 2014 - June 1st 2014
Australia: April 11th 2014 - May 11th 2014

Gift:
Magmar (X), Electabuzz (Y)

Method:
In Europe & Australia, to celebrate a new promotion to push Pokémon, various game specialist stores were offering free download codes for Magmar for Pokémon X players and Electabuzz for Pokémon Y players. These Pokémon come holding their evolution item.

Electabuzz
Level 30
OT:SPRING 2014
ID:04014
Ability:Vital Spirit
Hold Item:

Electirizer
Any Nature.
Date of Receiving
Lovely place. Apparently had a fateful encounter at Lv. 30
Low Kick
Shock Wave
Light Screen
Thunder Punch
Magmar
Level 30
OT:SPRING 2014
ID:04014
Ability:Vital Spirit
Hold Item:

Magmarizer
Any Nature.
Date of Receiving
Lovely place. Apparently had a fateful encounter at Lv. 30
Smokescreen
Fire Spin
Confuse Ray
Fire Punch

Movie Darkrai
Release Dates:

Japan: April 18th 2014 - September 30th 2014

Gift:
Darkrai

Method:
In Japan, when you prebook the ticket to the movie, Cocoon of Destruction & Diancie, you will be eligible for a download of the Pokémon, Darkrai. Unlike previous pre-booking distributions, this one is distributed via a serial code found on the ticket. It has the special move of Phantom Force..

ダークライ
Level 50
OT:????
ID:???
Ability:Bad Dreams
Hold Item:
No Item
Any Nature.
Date of Receiving
Pokémon Movie 14. Apparently had a fateful encounter at Lv. 50
Dark Void
Dark Pulse
Phantom Force
Dream Eater
 
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