Nintendo have quietly given owners of Pokémon Omega Ruby and Pokémon Alpha Sapphire the chance to get the Eon Ticket through Mystery Gift in the US and Europe.
The codes only work until tomorrow, so if you're after the ticket you had better be quick. The codes are as follows:
The US code is: 2015LATIOSLATIAS
The European code is: POKEMON380381
If you don't get to the codes in time don't forget that the Eon Ticket is also passed around by StreetPass so there is still a chance you'll come across it at some point!