Salamence-Mega @ Salamencite  
Ability: Intimidate  
EVs: 172 Atk / 84 SpA / 252 Spe  
Naive Nature  
- Hyper Voice  
- Double-Edge  
- Roost  
- Protect  

Gastrodon (Gastrodon-East) @ Wiki Berry  
Ability: Storm Drain  
EVs: 236 HP / 152 Def / 36 SpA / 84 SpD  
Relaxed Nature  
IVs: 0 Atk / 21 Spe  
- Earth Power  
- Icy Wind  
- Toxic  
- Recover  

Genesect @ Choice Scarf  
Ability: Download  
Shiny: Yes  
EVs: 164 Atk / 92 SpA / 252 Spe  
Hasty Nature  
- U-turn  
- Iron Head  
- Ice Beam  
- Energy Ball  

Tapu Bulu @ Figy Berry  
Ability: Grassy Surge  
EVs: 252 HP / 56 Atk / 96 SpD / 104 Spe  
Adamant Nature  
- Wood Hammer  
- Superpower  
- Swords Dance  
- Protect  

Incineroar @ Iapapa Berry  
Ability: Intimidate  
EVs: 252 HP / 72 Atk / 20 Def / 152 SpD / 12 Spe  
Adamant Nature  
- Fake Out  
- Flare Blitz  
- Knock Off  
- U-turn  

Zygarde @ Dragonium Z  
Ability: Aura Break  
EVs: 96 HP / 224 Atk / 8 SpD / 180 Spe  
Adamant Nature  
- Thousand Arrows  
- Outrage  
- Dragon Dance  
- Protect  

Spread notes:
Mega Salamence OHKOes 0/4 Mega Charizard Y with Double-Edge
Gastrodon is as fast as possible while still underspeeding Diancie in TR
Tapu Bulu outspeeds -1 Kyurem-B so that it can hit it with Superpower after Gastro slows it with Icy Wind
Incin takes two LOKB Earth Powers after SR since that's such a rough mu for the team
Zygarde takes two Kart Leaf Blades or a Scarf Lele Moonblast and outspeeds Mega Mane at +1