If you have a good competitive moveset for Greninja (or Ash-Greninja), post an answer below and upvote the best ones. Movesets for any of its pre-evolutions can also be shared on this thread.
Be sure to include full set details in your post, e.g. items, abilities, natures and EVs. Some detail, including the intended game mode for your set, is also appreciated. Access the full list of guidelines here.
Greninja Pokédex and learnset for reference.
Here's a Gen 9 NatDex OU set for Greninja-Bond. Note: Ash-Greninja has been removed from the games upon the release of SV.
Not Green Ninja (Greninja-Bond) (M) @ Loaded Dice Ability: Battle Bond Tera Type: Water EVs: 4 HP / 252 SpA / 252 Spe Timid Nature - Dark Pulse (Great STAB, a lucky flinch might save you the game) - Water Shuriken (Incredibly good STAB, Loaded Dice helps a lot) - Extrasensory (Coverage against Fighting types, flinching is great) - Ice Beam (Great coverage and can decimate Gliscor)
This is used as a sweeper set (if you didn't notice) in Gen 9 NatDex OU. Water Shuriken and Dark Pulse is great STAB and this set centers off of Water Shuriken. Loaded Dice helps Water Shuriken a lot, and if you can get the KO you can start sweeping.
This thing is my favorite with your battle bond greninja this will be perfect special attacker and spike abuse with high speed and high SpA
Greninja @ Waterium Z / Expert belt Ability: Battle Bond EVs: 4 Atk / 252 SpA / 252 Spe Modest Nature - Hydro Pump - Dark Pulse - Spikes - Surf / U-turn
For Waterium Z user use spikes then hydro vortrex and then go destroy your enemy with surf and dark pulse
Greninja @ Leftovers Ability: Protean Tera: Stellar EVs: 4 SpA / 252 HP / 252 Spe Hardy Nature - Water Shuriken - Dark Pulse - Ice Beam - U-turn
u-turn for scouting. ice beam is fast freezes, and coverage. dark pulse is STAB, like everything I guess. water shuriken is INCREDIBLE now it gets priority and multihit. This thing is sooooooo good.
Greninja @ greninjite Ability: protean EVs: 4 HP/ 252 SpA/ 252 Spe Timid/Modest nature -surf (STAB) -water shuriken (STAB) -dark pulse (STAB) -ice beam (Coverage) This greninja works best in Pokemon champions, but it still works in z-a
I think this will do it.
Greninja @ Life Orb Ability: Torrent / Protean EVs: 6 HP / 252 Atk / 252 Spe Bashful Nature - Water Shuriken - Dark Pulse - Aerial Ace - Taunt
So basically Water Shuriken is a good and strong move that can hit multiple times. Water Shuriken can double or triple the damage from the first shuriken. Dark Pulse is great STAB and can flinch Pokemon. Aerial Ace covers at least 3 out of 5 of its weaknesses due to its typing. Taunt can stop Pokemon like Hariyama from using Belly Drum.
Hope this moveset helps!