Japanese Pokémon Centers will be giving away eggs of these six Pokémon starting on January 5th to celebrate the Year of the Dragon:
Here's the thing... they're all gonna be shiny and since eggs can't have ribbons.. they will be tradeable over the GTS. If you restrict your searches for these guys to Japan between lv 1 - 10... you may get lucky and find one where the person offering them isn't asking for anything too ridiculous (I'm sure you will also see some untradeable ones too where the person wants a Lv. 9 or under legend). Some kids don't even know what shinies are so I would expect to see some up for legendaries. I personally plan on stocking up on random legends online over the next couple of days to try to get at least one of these.. or at least try. They may also have other things special about them, such as moves they can't normally learn or hidden abilities, but so far none of that info has been released.