Greninja got banned after ORAS made it stupid.
Given the current format they clearly don't care about people needing to hack.
That doesn't really sound like a legit reason, especially when it's clear that people gen their Pokemon to save time from breeding and EV training. Not to mention, IIRC, there's no way to hackcheck these pokemon beyond the facile physical attributions like the Kalos hexagon, so they won't even be able to tell the difference between unless they look at the software. It's also worth noting that VGC 2014's winner used PokeGen but clearly overlooked the limitations of the B2W2 carts.
Well of course but half of those weren't even legally distributed in NA or Europe until this year so there was no way to even get them unless you genned them. At least everyone can soft reset or hack for the legendaries that are actually in the game.
When all players need to go to Japan to legally get a Manaphy, then it's no wonder they're banned.
so you have no idea what you're talking about
gotcha
Constant switching and some battles taking over 100 turns to complete is not fun even when you're playing.