Media Create Sales: Week 27, 2014 (Jun 30 - Jul 06)

In the case of Pokémon XY, 3D isn't a new thing anymore, it negatively affected roster size and all the other factors that also contributed to PS era boosts are missing as well. 3DS is more comparable to PS2 and SFC than to FC and PS. The follow up gen to a huge platform often has better libraries in terms of core content but with less of the casual audience than before, the biggest franchises suffer. Pokémon is big enough to be affected by that lost audience, just less than a more casual heavy franchise like Layton was.
Well this is wrong. It didn't affect roster size at all. People are just ridiculously not counting Mega Evolutions. Including them, it's 102 which is on-par for an even numbered generation.