Er, sorry. I saw this post and felt the need to respond for clarification so this isn't actually related to the blazi discussion. Also, sorry if I say stuff you mentioned in an above post I skimmed through them.
There are lots of things to correct with your post. First of all, Greninja was always considered "insane" ever since it got released into competitive mons. I mean, the fact that it had access to an ability that changed your type to whatever move you were using granting STAb everywhere is just crazy. That, as well as its high speed tier and decent special attack is such a problem for everything. At this point, it was able to nearly sweep types like ground and have virtually no switch in.
Now, for ORAS, Greninja learned gunk shot and low kick giving it access to an even better movepool and access to nearly ohko clefable. The greninja sets became so unpredictable with this as it could run a whole bunch of moves. Main moves: Hydro Pump, Ice Beam, Dark Pulse, Extrasensory, Hidden Power [Fire], Gunk Shot, Low Kick, U-Turn, Grass knot. This moveset is really extreme and by the way, under no circumstance would greninja run
max attack as it is mainly a special hitter. Note: some evs were thrown into attack for OHKOs like on clefable and such.
Sorry, just wanted to point out that those two moves didn't "make it broken" but it was always broken and those moves were sort of like the final straw. Hope this clarifies any discussion on the possibility of Greninja being unbanned for now.
(Edit: max attack on the yung band ninja creds to
Sabella and azian and
all falls down for that)