For anyone who's wandered here from the great ether, here's the rundown:
-Someone dumped the distribution card NOA mails out to stores to distribute their event pokemon. That is to say, they actually distribute these pokemon using a regular DS Game.
-Inside the rom for this "game", there is a section of data where the deoxys resides. Because we're the curious sort, we found a way to replace this data.
-Using PokeSav (see pokesav.org for tutorials) you can create a "WonderCard" file, which is an 856kb .pcd file. These can contain pokemon, items, and a number of other things.
-Using Cracker's patch (backtrack a few posts, it's linked in something like pmwcdp.rar) you can drag'n'drop the new .pcd file to the patcher, and it will "replace" the deoxys data with the new wondercard (whether it be an item, pokemon...etc)
-With a flash cart, you can now run the patched rom to distribute your custom content to other pokemon games, whether they're backups OR legit carts.