About the 10ANNIV Distribution Cartridge:

This is the distribution cartridge used for the Pokemon 10ANNIV event distributions in the United Kingdom, then later other European counties. These Pokemon were distributed for a limited time back in 2006 to celebrate the 10th anniversary of Pokemon.

With this you can send a legit 10ANNIV Charizard, Pikachu, Articuno, Raikou, Entei, Suicune, Lugia, Ho-oh, Latias and Latios to your Pokemon Ruby, Sapphire, Emerald, LeafGreen or FireRed GBA Games.

Equipment Required:

2x GBA's
1x link cable (original cable works, 3rd party cables might not work)
1x Distribution cart
1x Pokemon Ruby, Sapphire, Emerald, LeafGreen, FireRed cart from the language of the distribution you are using.(or 1MB Flash Cart)

Procedure:

Save in a Pokemon center and have at least 1 free slot in your party
Now turn off the receiving system.
Turn on the sending system with the distribution cart inside, connect with a link cable to the receiving system with the Pokemon 3rd gen cart inside and select the Pokemon to transfer.
Turn on the receiving system WITHOUT any cart inside, or hold start and select as you power the receiving system on, leaving the cartridge in
After a couple seconds you'll see a colored Nintendo logo appearing on the receiving system. When you see it, put the Pokemon 3rd gen cart inside the receiving system. If you held start and select keeping the cartridge in, the distribution process will simply happen.
You'll see a screen that tells you a Pokemon is being received. That Pokemon will be in your party.

Troubleshooting:

Ensure you are using an a Pokemon game that matches the language of the distribution you are using, for example the English distribution and an English Pokemon game. It is not possible to mix and match different languages, however you can trade the Pokemon to a different language game once distributed.

You are following the procedure perfectly (receiving cart first not inserted, then inserted when Nintendo logo appears)

Have saved in a Pokemon center and have at least a free slot in the party

If the transfer gives you an error, try changing the link cable ( some 3rd cables don't work), the gba systems or the receiving cart ( unofficial carts could not work).

It the cart suddenly doesn't transfer Pokemon anymore then just turn both the systems off and on again.

 Supports American Cart, French Cart, German Cart, Italian Cart and Spanish Cart. Note that these Cart must be original, (or 1MB Flash Cart) low-priced Chinese imitation Cart cannot be used.