Greninja is the most OU this gen by an absolute mile. Everyone has a greninja. EVERYONE I hate it so much. It's so good at sweeping, glass canon or not, blistering speed + protean STAB + life orb. Everyone of his moves get like 50% more power I HATE GRENINJA AHHHHH
Learn to deal with him, he is no problem and has never been a threat for me.
Never been a threat? His movepool is incredible, he outspeeds timid alakazam, gets STAB for free on top of a very respectable base special attack and and extra 30% if they choose to run a life orb. It's a huge threat to everybody. It can OHKO a multiscale dragonite.