A while back, Nintendo announced the reveal of the Eon Ticket for Alpha Sapphire and Omega Ruby. With this, players are allowed to catch both Latios and Latias for their game. For that you had to wait until somebody on StreetPass with the ticket interacted with you, then you would receive it.
From now until Monday, March 2 you will be able to grab it in a much easier fashion. Just enter the code 2015LATIOSLATIAS in the Mystery Gift selection at the start-up screen and you’ll be good to go.
If you’ve already received the item, this code will not work. Hopefully, in the future, those who’ve missed this easier opportunity will be able to obtain it, but until then, you’ve only got a little bit of time to take advantage of this offer.