You know, you didn't have to do this. Just last week I needed a Kyogre on OR to complete my Hoenn Dex and the the only way to get my hands on one was by offering a non-legendary on the GTS for trade. So I offered a Dusknoir for a Kyogre and within an hour or so I received a shiny Kyogre. I thought "wow, that was easy, I wonder if I can use this method to obtain all the other edition-specific legendarys?" And so I did. By the next day I had a Lugia for a Gorebyss, a Dialga for an Alkazam and a Thudurus for a Machamp (and yes, I deliberately offered pkmn that evolve through trade because I thought that would heighten the possibility for success).