Not sure... (Landorus-Therian) @ Rocky Helmet
Ability: Intimidate  
EVs: 248 HP / 204 Def / 28 SpD / 28 Spe  
Impish Nature  
- Stealth Rock  
- Earthquake  
- U-turn
- Hidden Power [Ice]  

Could be... (Tapu Koko) @ Mago Berry  
Ability: Electric Surge  
EVs: 252 HP / 28 SpA / 12 SpD / 216 Spe  
Timid Nature  
- Thunderbolt  
- Nature's Madness  
- U-turn  
- Taunt  

Who am I? (Beedrill-Mega) @ Beedrillite  
Ability: Sniper  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Poison Jab  
- U-turn  
- Drill Run  
- Knock Off  

Is it me? (Zoroark) @ Choice Scarf  
Ability: Illusion  
EVs: 64 Atk / 4 Def / 252 SpA / 188 Spe  
Rash Nature  
- Extrasensory
- U-turn
- Flamethrower  
- Hidden Power [Ice]  

From shadows (Greninja-Ash) @ Choice Specs  
Ability: Battle Bond  
EVs: 4 Def /252 SpA / 252 Spe  
Timid Nature  
- Hydro Pump  
- Water Shuriken  
- Dark Pulse  
- U-turn  

The end! (Zygarde) @ Leftovers  
Ability: Aura Break  
EVs: 240 HP / 212 SpD / 56 Spe  
Careful Nature  
- Substitute  
- Coil  
- Thousand Arrows  
- Toxic