Clone
Free Gliscor
Low Kick is really just a mediocre option. It works, sure, but Hydro Pump is more consistent than Low kick, as a Move that's of mediocre BP against most things that comes off of a significantly less invested attack stat is usually not worth the moveslot. It works well as a lure, but is in no way standard, as Hydro hits things harder most of the time anyways.I thought Hydro Pump was not really as common any more. Low Kick hits common Water STAB targets (Heatran, TTar) about as hard or harder, while also hitting Ferro and Chansey hard.
The only real deviations I've seen from the countless battles I've seen with Greninja (I didn't play all of them btw, just most) are HP Fire > Dark Pulse or Spikes > Gunk Shot when paired with like Metagross, Bisharp, or Scizor. GK and Low Kick are generally the least used of his clever age options due to only hitting specialized targets.