Why are you using av Greninja? It literally has zero bulk. Use either the standard Ash Greninja set or a protean one, depending on what you want
Greninja-Ash @ Choice Specs
Ability: Battle Bond
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Spikes
- Dark Pulse
- Hydro Pump
- Water Shuriken
or
Greninja @ Life Orb
Ability: Protean
EVS: 176 Atk / 80 SpA / 252 Spe
Hasty / Naive Nature
- Rock Slide
- Gunk Shot
- Ice Beam
- Extrasensory
Why are you using expert belt on Heatran when it has so many utility options, all of which are more useful than it being an attacker? I suggest magma trap Heatran instead for easier time against the many walls
Heatran @ Leftovers
Ability: Flash Fire
EVs: 248 HP / 8 Def / 252 SpD
Calm Nature
- Taunt
- Earth Power
- Stealth Rock
- Magma Storm
Drop Jumpluff. There is literally no reason to use this thing in ou. Personally, I would suggest Tornadus for some sort hazard control. Always good to have a backup in case Diancie can't switch in
Tornadus-Therian @ Rocky Helmet
Ability: Regenerator
EVs: 248 Hp / 8 Def / 252 Spe
Timid Nature
- Defog
- U-turn
- Hurricane
- Knock Off
Change Kommo nature to jolly since its speed sucks
Scolipede is pretty meh in ou since stealth rock is everywhere and even after swords dance, it isn't really hitting that hard and Greninja is the best sweeper in the tier. I suggest changing it to swords dance life orb Kartana or scarf one for extra wall breaking potential, depending on which Greninja you want
Kartana @ Life Orb
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Leaf Blade
- Knock Off / Smart Strike
- Sacred Sword
- Swords Dance
or
Kartana @ Choice Scarf
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Leaf Blade
- Knock Off
- Smart Strike
- Sacred Sword
