The Pokémon Centers will be doing a special giveaway campaign between January 11th, 2014 and February 23rd, 2014. The event is being held to commemorate the naming of the Pokémon Holo Caster mascot: By showing a staff member at a Pokémon Center the special Hologram Mail that was sent out to the Holo Caster today to inform of this event, patrons will receive a sticker featuring the mascot, with his name printed on it. The stickers are limited in number, and will be available on a first-come-first-serve basis.
Our Holo Caster page
has been updated with this Hologram Mail, as well as the other mail that went out today informing about the O-Power giveaway at the World Hobby Fair.
Update: A picture of the sticker, with the mascot's name revealed:
Its name is
Spoiler: Click to show!
Source: The Pocket Monsters X/Y Holo Caster