#0718 · Gen 6 · Legendary

Zygarde (Mega) — Best counters

Weaknesses

ice×2.56 double weaknessdragon×1.60fairy×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Kyurem (White)	iceIce Fang	iceBlizzard	Snow	10017.2
2	Eternatus	dragonDragon Tail	dragonDynamax CannonELITE	Windy	8514.6
3	Kyurem (Black)	dragonDragon Tail	iceBlizzard	Snow · partial	8414.5
4	Baxcalibur	iceIce Fang	iceBlizzard	Snow	8214.1
5	Glalie (Mega)	iceIce Shard	iceAvalanche	Snow	8113.9
6	Rayquaza (Mega)	dragonDragon Tail	dragonBreaking SwipeELITE	Windy	8113.9
7	Gardevoir (Mega)	fairyCharm	iceTriple Axel	Snow · partial	7813.5
8	Weavile	iceIce Shard	iceAvalanche	Snow	7813.4
9	Eternatus (Eternamax)	dragonDragon Tail	dragonDynamax CannonELITE	Windy	7713.2
10	Glaceon	iceIce Shard	iceAvalanche	Snow	7613.2
11	Kyurem	dragonDragon Breath	iceGlaciateELITE	Snow · partial	7412.8
12	Mamoswine	icePowder Snow	iceAvalanche	Snow	7412.7
13	Abomasnow (Mega)	icePowder Snow	iceBlizzard	Snow	7412.7
14	Garchomp (Mega)	dragonDragon Tail	dragonBreaking Swipe	Windy	7212.5
15	Jynx	iceFrost Breath	iceAvalanche	Snow	7112.2
16	Salamence (Mega)	dragonDragon Tail	dragonDraco Meteor	Windy	6912.0
17	Vanilluxe	iceFrost Breath	iceAvalancheELITE	Snow	6911.9
18	Porygon Z	normalLock On	iceBlizzard	Snow · partial	6811.8
19	Cetitan	iceIce Shard	iceAvalanche	Snow	6711.5
20	Avalugg (Hisui)	icePowder Snow	iceBlizzard	Snow	6611.3

Ice hits for ×2.56 — Zygarde (Mega)'s Dragon/Ground typing is double-weak, so those attackers outperform their score gap.
Snow weather boosts Ice moves ×1.2 — the best time to battle Zygarde (Mega).

Rankings are estimated cycle DPS (attack stat × move damage ÷ cycle time, with STAB and type effectiveness). Not a full battle simulation.