I'm kinda shocked you guys didn't say anything about Greninja.
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Nature: Timid/Hasty (if running U-turn)
EVs: 4 HP, 252 SpA, 252 Spe
- Hydro Pump/Ice Beam/Grass Knot/Thunderbolt/Fire Blast/Dazzling Gleam/Shadow Ball/Focus Blast/U-turn/Sludge Bomb
- Hydro Pump/Ice Beam/Grass Knot/Thunderbolt/Fire Blast/Dazzling Gleam/Shadow Ball/Focus Blast/U-turn/Sludge Bomb
- Hydro Pump/Ice Beam/Grass Knot/Thunderbolt/Fire Blast/Dazzling Gleam/Shadow Ball/Focus Blast/U-turn/Sludge Bomb
- Hydro Pump/Ice Beam/Grass Knot/Thunderbolt/Fire Blast/Dazzling Gleam/Shadow Ball/Focus Blast/U-turn/Sludge Bomb
Just run four of the above moves and decimate many things. Granbull gave it a TON of coverage.
Alternatively you could run...
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Nature: Jolly
EVs: 4 HP, 252 Atk, 252 Spe
- Close Combat/Play Rough/Stone Edge/Earthquake
- Close Combat/Play Rough/Stone Edge/Earthquake
- U-turn
- Shadow Sneak/Water Shuriken
Run this to surprise special walls that come in thinking that they're going to take all the hits.
252 Atk Life Orb Protean Greninja Close Combat vs. 252 HP / 252+ Def Eviolite Chansey: 546-642 (77.5 - 91.1%) -- guaranteed 2HKO
252 Atk Life Orb Protean Greninja Play Rough vs. 252 HP / 0 Def Florges: 212-251 (58.8 - 69.7%) -- guaranteed 2HKO after Leftovers recovery
252 Atk Life Orb Protean Greninja Play Rough vs. 252 HP / 0 Def Goodra: 416-491 (108.3 - 127.8%) -- guaranteed OHKO
Or you could run a mixed attacking set.
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Nature: Hasty
EVs: 160 Atk, 96 SpA, 252 Spe
- Close Combat
- Shadow Ball
- Hydro Pump/Ice Beam/Grass Knot/Thunderbolt/Fire Blast/Dazzling Gleam/Focus Blast/Sludge Bomb
- Play Rough/Stone Edge/Earthquake
Look at these calcs.
160 Atk Life Orb Protean Greninja Close Combat vs. 252 HP / 252+ Def Eviolite Chansey: 502-593 (71.3 - 84.2%) -- guaranteed 2HKO
160 Atk Life Orb Protean Greninja Play Rough vs. 252 HP / 0 Def Florges: 195-230 (54.1 - 63.8%) -- guaranteed 2HKO after Leftovers recovery
160 Atk Life Orb Protean Greninja Play Rough vs. 252 HP / 0 Def Goodra: 382-452 (99.4 - 117.7%) -- 93.8% chance to OHKO
96 SpA Life Orb Protean Greninja Fire Blast vs. 252 HP / 0 SpD Tangrowth: 601-710 (148.7 - 175.7%) -- guaranteed OHKO
96 SpA Life Orb Protean Greninja Fire Blast vs. 252 HP / 0 SpD Skarmory: 463-549 (138.6 - 164.3%) -- guaranteed OHKO
96 SpA Life Orb Protean Greninja Fire Blast vs. 252 HP / 0 SpD Ferrothorn: 614-723 (174.4 - 205.3%) -- guaranteed OHKO
160 Atk Life Orb Protean Greninja Close Combat vs. 252 HP / 0 Def Heatran: 361-429 (93.5 - 111.1%) -- 62.5% chance to OHKO
96 SpA Life Orb Protean Greninja Fire Blast vs. 252 HP / 4 SpD Filter Mega Aggron: 312-368 (90.6 - 106.9%) -- 43.8% chance to OHKO
The only real thing that walls it is Mega Venusaur!
96 SpA Life Orb Protean Greninja Fire Blast vs. 252 HP / 4 SpD Thick Fat Mega Venusaur: 151-179 (41.4 - 49.1%) -- guaranteed 3HKO
And in return...
0 SpA Venusaur Sludge Bomb vs. 4 HP / 0 SpD Greninja: 153-180 (53.4 - 62.9%) -- guaranteed 2HKO
However...
96 SpA Life Orb Greninja Fire Blast vs. 252 HP / 80 SpD Thick Fat Venusaur: 140-166 (38.4 - 45.6%) -- guaranteed 2HKO after Stealth Rock and 1 layer of Spikes
Its bane is priority, though...
252 Atk Choice Band Talonflame Brave Bird vs. 4 HP / 0- Def Greninja: 330-388 (115.3 - 135.6%) -- guaranteed OHKO
252+ Atk Choice Band Huge Power Azumarill Aqua Jet vs. 4 HP / 0- Def Greninja: 184-217 (64.3 - 75.8%) -- guaranteed 2HKO
252 Atk Life Orb Technician Breloom Mach Punch vs. 4 HP / 0- Def Greninja: 199-234 (69.5 - 81.8%) -- guaranteed 2HKO
252+ Atk Technician Scizor Bullet Punch vs. 4 HP / 0- Def Greninja: 166-196 (58 - 68.5%) -- guaranteed 2HKO
252 Atk Mega Absol Sucker Punch vs. 4 HP / 0- Def Greninja: 225-265 (78.6 - 92.6%) -- guaranteed 2HKO
252+ Atk Huge Power Mega Mawile Bullet Punch vs. 4 HP / 0- Def Greninja: 190-225 (66.4 - 78.6%) -- guaranteed 2HKO
252+ Atk Huge Power Mega Mawile Sucker Punch vs. 4 HP / 0- Def Greninja: 254-299 (88.8 - 104.5%) -- 31.3% chance to OHKO