Satomine Night
The Power of Z!
Shh...you can't suggest anything other than that XY is the worst series in every way.
Really don't see how Greninja hogged things when Talonflame was shoved in our faces every gym battle and everyone but Noivern got at least one gym victory, if not multiple, while Greninja didn't start taking up the screen until Olympia (and really not until after).
I could be wrong (since I'm not among the people who feel this way), but perhaps the notion that Greninja hogged so much screentime is rooted in its story arc still being so fresh in viewers' minds and that, for much of XY&Z, Greninja got more focus than the rest of Ash's Pokémon. But while Greninja got a lot of focus during the Ash-Greninja arc, that story arc really only encompassed approximately 22 episodes, including the Team Flare climax. That's 22 episodes out of 140. Outside of the Ash-Greninja arc, it was mostly showcased during Gym battles. I wouldn't really consider that hogging too much screentime.