http://replay.pokemonshowdown.com/proteanpalace-248488708
So outside of this battle being hilarious with the Wonder Guard shenanigans, it features a clean sweep by Zygarde.
Zygarde @ Leftovers
Ability: Aura Break
EVs: 252 HP / 252 Atk / 4 Spe
Adamant Nature
- Coil
- Stone Edge
- Earthquake / Substitute
- Extreme Speed
Holy crap, this is amazing. Bulky Coil Zygarde has swept in roughly 60% of my battles so far. Even though the battler had some questionable choices (Dual Chop Hawlucha), Zygarde still would've survived a HJK due to its poison typing. Coil is not only a great boosting move, but also makes me immune to Toxic. Stone Edge and Earthquake is for EdgeQuake coverage, although Earthquake can be swapped out for Substitute to prevent status. Usually, I click Stone Edge for the crit chance, but Earthquake was won me a battle before due to the ability to play mindgames. Finally, Extreme Speed is the best move on this set, as with Protean and boosts it hits extremely hard. It's also hard to revenge kill because of the defense boost, and most physical attackers can't do much in general.
Both sets are good though, and you can choose according to which one fits your team better!
So outside of this battle being hilarious with the Wonder Guard shenanigans, it features a clean sweep by Zygarde.
Zygarde @ Leftovers
Ability: Aura Break
EVs: 252 HP / 252 Atk / 4 Spe
Adamant Nature
- Coil
- Stone Edge
- Earthquake / Substitute
- Extreme Speed
Holy crap, this is amazing. Bulky Coil Zygarde has swept in roughly 60% of my battles so far. Even though the battler had some questionable choices (Dual Chop Hawlucha), Zygarde still would've survived a HJK due to its poison typing. Coil is not only a great boosting move, but also makes me immune to Toxic. Stone Edge and Earthquake is for EdgeQuake coverage, although Earthquake can be swapped out for Substitute to prevent status. Usually, I click Stone Edge for the crit chance, but Earthquake was won me a battle before due to the ability to play mindgames. Finally, Extreme Speed is the best move on this set, as with Protean and boosts it hits extremely hard. It's also hard to revenge kill because of the defense boost, and most physical attackers can't do much in general.
If you use Life Orb, I'd probably suggest Dragon Dance and a Jolly Nature instead of Adamant and Coil, because yours is more offensively oriented. Also, Coil seems kind of contradictory because of Life orb: what's the point of boosting defense if you're going to be chipping your health away? Also, none of your moves benefit from having more accuracy, and Zygarde would much rather prefer the Speed.Zygarde @ Life Orb
Ability: Aura Break
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Coil
- Extreme Speed
- Earthquake
- Brick Break
http://replay.pokemonshowdown.com/proteanpalace-248378913
Looking at this replay, not only does zygarde outspeed gliscor (due to a full all-out EV set), but also can make advantage of anything gliscor throws at it. The coil boost allowed an instant OHKO on the dark-typed gliscor, which was obviously going to use toxic to break the setup I'd pulled off instantly. Regardless of whether the move had been taunt, knock off, or even earthquake (to check the coil poison typing), it was still an obvious outcome in the end. Plus, with +1 defense, EQ does hardly anything to zygarde-poison type. Even without life orb, leftovers can be a possible item for zygarde, as shown in this replay here: http://replay.pokemonshowdown.com/proteanpalace-248380212
The only way I see gliscor having anything against a zygarde is if it can instantly get off a toxic upon switch-in, OR it runs subtox set, which in this meta, I don't think a lot of stalling teams would generically use.
Both sets are good though, and you can choose according to which one fits your team better!