Sorry to just jump in out of nowhere here, but I'm really beginning to think that Greninja's beginning to be too much. I wanted it to be
worse in ORAS (meaning one of the megas could counter it), but nope. Say hello to Gunk Shot and Low Kick, which demolish former checks and counters Sylveon, Clefable, and Ferrothorn. I don't mean to sound like I don't brainstorm about checking Greninja, because it
is possible. Brave Bird Talonflame, priority...I dunno what else. Mega Sceptile? I'd say Mega Sceptile, but I'm not running a mega exclusively to check Greninja - and I've actually seen Choice Scarf Greninja a lot lately, so Sceptile becomes irrelevant. Yes, you can say that it's walled by something if it opts for, say, Hidden Power Fire over Gunk Shot, but there's no way to KNOW what it has and what it doesn't. On an offensive team like mine, I ain't got no time to scout for moves. It lives to murder things and murders to live things.
Except they're not even soft counters. They can get 2HKOed by some move Greninja runs, and, as
Karxrida
Porygon2 and Rest-Talk Gyarados are counters though, but are you really going to run those Pokemon on offense, which as it stands is basically limited to Mega Lopunny for something that can switch in on anything Greninja has once and threaten it out (only before it Mega Evolves though & only if it has Fake Out, Extrasensory is a clean OHKO)? Hell, RT Gyarados only really works on stall teams, so not even balance can use that one.
And you're absolutely right. The only true counters to Greninja are not even viable to use on offensive and balance teams, and I'm surely not changing to STALL so I can just not care about Greninja anymore. With so many moves, it has so many possible sets. Hydro Pump, Hidden Power Fire, Ice Beam, Gunk Shot, Low Kick, Extrasensory, Grass Knot, Dark Pulse...I can go on and on. Each one of those coverage moves dismantles SOMETHING because of Protean: Hidden Power Fire burns Ferrothorn to death, Gunk Shot murders fairies, Low Kick murders Ferrothorn and Empoleon, Extrasensory murders Venusaur, Grass Knot murders water-types like Suicune, and Dark Pulse murders Slowbro. Sure, it's got bad defenses. But that doesn't matter - Greninja is so effecient at what it does that its defenses almost don't matter. I get when someone says "oh it's frail so it's not ban-worthy imo" but I find myself, when making teams, thinking "darn, how am I gonna get rid of that blasted frog" or "oh dang it, i'm weak to ninja, better redo the team" before anything else.