Global Battle Union

Within the Global Link, there is the Global Battle Union feature. This feature essentially gives a ranking system for the battles you partake in through the Random Match feature of the game, speciafically when it's a Rating Mode battle. Each player starts off with a point value of 1500 and when you win or lose in a Random Match battle, the score will go up and down depending on how well you have done.

These are ranked within several different categories;
Total - Your total score
Single Battle - Your score in Single Battles
Double Battle - Your score in Double Battles
Triple Battle - Your score in Triple Battles
Rotation Battle - Your score in Rotation Battles
Shooter Battle - Your score in Shooter Battles

There are also going to be various tournaments over Random Match Wi-Fi for which you'll be able to sign up on this site.

In the profile of the Global Link, you'll be able to access a variety of features including your own battle record, how well you did in the Global Link competitions and you can store a number of Battle Videos which you class as your favourites. These are visible to all of your friends.

Random Match

To access the Random Match part of the game, talk to the attendant on the right on the top floor of each Pokémon Centre. Random Match will be an option under the GTS. Here, you can go in and select the various Random Match styles you want. You'll be able to play with people over WiFi who aren't in your friends list.

Rules
Pokémon of Level 51 or above are lowered to Level 50 while those under Level 50 will remain their current level
You cannot have two of the same Pokémon or item in your team
Items that aren't available in Generation V as of yet, including event Berries, cannot be used
No Pokémon with the move Sky Drop can be used
Two minutes to decide upon the moves to use
Matches last no more than one hour

Battle Styles
Single Battle - Use 3 Pokémon
Double Battle - Use 4 Pokémon
Triple Battle - Use 6 Pokémon
Rotation Battle - Use 3 Pokémon
Shooter Battle - Use 6 Pokémon in a Triple Battle

Random Match Modes
Rating Mode - Uses your battle stats to be included in the Battle Union's ranking system. Requires Global Link syncing
Free Mode - Only tracks your Win/Loss for your Trainer Card

Not all Pokémon are usable in the Random Match feature with almost all legendary Pokémon banned. The list of the Pokémon which cannot be used is as follows:

No. Pic Name Type Abilities Base Stats
HP Att Def S.Att S.Def Spd
#150 Mewtwo
ミュウツー
Pressure
Unnerve PDW
106 110 90 154 90 130
#151 Mew
ミュウ
Synchronize 100 100 100 100 100 100
#249 Lugia
ルギア
Pressure
Multiscale PDW
106 90 130 90 154 110
#250 Ho-oh
ホウオウ
Pressure
Regenerator PDW
106 130 90 110 154 90
#251 Celebi
セレビィ
Natural Cure 100 100 100 100 100 100
#382 Kyogre
カイオーガ
Drizzle 100 100 90 150 140 90
#383 Groudon
グラードン
Drought 100 150 140 100 90 90
#384 Rayquaza
レックウザ
Air Lock 105 150 90 150 90 95
#385 Jirachi
ジラーチ
Serene Grace 100 100 100 100 100 100
#386 Deoxys
デオキシス
Pressure 50 150 50 150 50 150
#441 Chatot
ペラップ
Keen Eye
Tangled Feet
Big Pecks PDW
76 65 45 92 42 91
#483 Dialga
ディアルガ
Pressure
Telepathy PDW
100 120 120 150 100 90
#484 Palkia
パルキア
Pressure
Telepathy PDW
90 120 100 150 120 100
#487 Giratina
ギラティナ
Pressure
Telepathy PDW
150 100 120 100 120 90
#489 Phione
フィオネ
Hydration 80 80 80 80 80 80
#490 Manaphy
マナフィ
Hydration 100 100 100 100 100 100
#491 Darkrai
ダークライ
Bad Dreams 70 90 90 135 90 125
#492 Shaymin
シェイミ
Natural Cure 100 100 100 100 100 100
#493 Arceus
アルセウス
Multitype 120 120 120 120 120 120
#494 Victini
ビクティニ
Victory Star 100 100 100 100 100 100
#643 Reshiram
レシラム
Turboblaze 100 120 100 150 120 90
#644 Zekrom
ゼクロム
Teravolt 100 150 120 120 100 90
#646 Kyurem
キュレム
Pressure 125 130 90 130 90 95
#647 Keldeo
ケルディオ
Justified 91 72 90 129 90 108
#648 Meloetta
メロエッタ
Serene Grace 100 77 77 128 128 90
#649 Genesect
ゲノセクト
Download 71 120 95 120 95 99