Alright then. This is going to be long and HARD to understand, Say thanks to my english. I'm not a ban fan, With this said I can start. I just think that things like Mega Mence and Mega Lucario were ban deserver.
The first ban reason for Greninja is his versatility?. That's where I disagree, There's lots of versatile pokes out there as well (I know, They don't have STAB). If something haves a huge movepool... It's a ban deserver?
No, if it has no viable counters/checks without limiting a play style. It does this vs offense and stall and its versatility just makes it harder to check and counter. Salamence in gen 4 was banned for this reason.
The second reason, It's hard to predict. Wow, Just wow. If you want to predict the move of the rival become a psychic, I know, I tend to predict as well but you can't rely on thoughts while battling, It's not smart. It's even stupid as can be. If you have your strategy breaked by YOUR own move it's not even logic to blame the poke. If you can predict every move and battle, Good for you but I still can't see this as something logic. you're the new Rommel
Um, see my above point. Also prediction is a key aspect of pokemon. If you cant predict you are bad at pokemon in most cases, unless you want to fodder your whole team. :\
The third reason if I'm correct is the new moveset. I have to agree with it, It's a beast with it. But, It haves a huge disadvantage with it. And that is, You have to reduce one of it's defenses, So now is even more fragile. And the life orb recoil is a clock on it, You're always going to get hit and killed by the recoil.
Greninja isnt going to "always" be taking hits. Its a frail sweeper that rips walls and offense apart. Switch it out and bring it back in later, watch something die, repeat, not hard.
The fourth reason is, You can't stall it?. Chansey with eviolite stops it. There's something on this planet that that thing doesn't resist without using knock off after?. I know, Chansey sucks hard on the physical side but nobody is going to let it go. So, You can stall it as well.
Are you kidding me? Chansey is 2hko'd by Low Kick with rocks up. :|
I don't remember the other reasons but, I want to say something related to other pokemon. Mega Sableye, It's hard to predict as well. Prankster before mega evolving and say Hi to Will-O-Wisp. Mega evolves?, You have to swallow the Will-O-Wisp, Rocks, Spikes, Thunder Wave whatever. The only poke that I found as a counter for it is Mega Diance, Bouncing everything and ripping him with Moonblast. But, Nobody is asking for a ban, Didn't they?
Sableye runs essentially the same set all the time, and regardless of the set it has the same counters and checks. :\ Just because "you" cant find more counters, that is your fault. Any fairy, Heatran, Suicune just to name but a few. There are common pokemon that counter it. Greninja requires niche **** to beat it and 2hkos and outspeeds most of the metagame. Sableye doesnt.