Zygarde @ Leftovers  
Ability: Power Construct  
EVs: 24 HP / 252 Atk / 232 Spe  
Adamant Nature  
- Thousand Arrows  
- Dragon Dance  
- Shore Up  
- Substitute/Dragon Tail
A niche option on the set above could be to run dragon tail over substitute. This will enable Zygarde to beat any other Zygarde which switches in while it is sweeping.

Zygarde @ Leftovers  
Ability: Power Construct  
EVs: 4 HP / 252 Def / 252 SpD  
Careful Nature  
- Thousand Arrows  
- Dragon Dance  
- Shore Up  
- Substitute/Thousand Waves
Thousand Waves can be ran to trap in pokémon such as Groudon but it is pretty sub-par, especially as nearly every pokémon in this tier has a high damage output so you can't trap in too many very safely.