The Holo Caster has been used in Pokemon X, Y, Omega Ruby, and Alpha Sapphire. Its primary function was to provide players with news pertaining to the games and real life events. Updates were done through SpotPass and downloaded manually from the internet. All regions received updates, though there hasn’t been much going on outside of Japan as of late.
Serebii now reports that the Holo Caster service has been discontinued. After logging in, a final notice is displayed, and states that the feature has been around for three years.