It can do that even if it doesn't appear in horizons. Greninja is greninja, it will always stay popular among people. They'd rather give the majority what they want.
If Liko and Roy were to visit Kalos, there might be a possibility that they could come across the vines laying in the shadows. Besides, it would be interesting to see how Liko and the others would react to a Pokémon using telepathy.
