I'm not exactly sure why, maybe it's just becuase not that many people watch it. I've only been watching the anime since 2013, but from old commercials and episodes I've seen, it appears that the anime was a decently popular primetime show from seasons 9 to 13. Once Gen 5 started, they rarely played any commercials and aired it only on weekends in the late morning. I'm not going to lie, I've never seen a single commercial for the Kalos anime on TV, only online. When a show gets pretty low ratings, Cartoon Network usually plays it only in the mornings, where most people are either asleep (on weekends) or at school/work (on weekdays). I've seen it happen to a handful of shows on the channel: Ben 10 Omniverse, The Garfield Show, Sonic Boom, and now Pokémon. While Sonic Boom is still airing (it has a pretty big internet following), the other two shows basically stayed in their early-morning time slots for a year or two until they got canceled, disappearing without a trace. I'm actually surprised the anime has been going for this long, seeing as it airs only a few times a week at a time where nobody watches TV. I think the anime would be better off if they moved it to a different channel. It happened before when it was taken off Kids WB, so I see no reason why it can't happen again.