#0717 · Gen 6 · Legendary

Yveltal — Best counters

Weaknesses

rock×1.60electric×1.60ice×1.60fairy×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Regieleki	normalLock On	electricThunder CageELITE	Rainy · partial	10013.3
2	Diancie (Mega)	rockRock Throw	fairyMoonblast	Overcast · partial	8711.5
3	Gardevoir (Mega)	fairyCharm	fairyDazzling Gleam	Overcast	8511.4
4	Manectric (Mega)	electricThunder Fang	electricWild Charge	Rainy	8211.0
5	Xurkitree	electricThunder Shock	electricDischarge	Rainy	8110.8
6	Kyurem (White)	iceIce Fang	iceBlizzard	Snow	8110.8
7	Ampharos (Mega)	electricVolt Switch	electricZap Cannon	Rainy	7910.5
8	Zekrom	electricCharge Beam	electricFusion BoltELITE	Rainy	7810.3
9	Tyranitar (Mega)	rockSmack DownELITE	rockStone Edge	Partly Cloudy	7610.2
10	Zacian (Crowned)	steelMetal Claw	fairyPlay Rough	Overcast · partial	7610.2
11	Deoxys (Attack)	poisonPoison Jab	electricZap Cannon	Rainy · partial	7610.1
12	Aerodactyl (Mega)	rockRock Throw	rockRock Slide	Partly Cloudy	749.8
13	Enamorus (Incarnate)	fairyFairy Wind	fairyDazzling Gleam	Overcast	739.8
14	Rampardos	rockSmack Down	rockRock Slide	Partly Cloudy	729.7
15	Thundurus (Therian)	electricVolt Switch	electricThunderbolt	Rainy	729.6
16	Tapu Koko	electricVolt Switch	fairyNatures MadnessELITE	Overcast · partial	719.5
17	Alakazam (Mega)	fightingCounterELITE	fairyDazzling GleamELITE	Overcast	699.2
18	Deoxys (Normal)	electricCharge Beam	electricThunderbolt	Rainy	699.2
19	Eternatus	poisonPoison Jab	dragonDynamax CannonELITE	Windy · partial	699.2
20	Kyurem (Black)	dragonDragon Tail	electricFusion Bolt	Rainy · partial	699.1

Yveltal is weak to Rock (×1.6), Electric (×1.6), Ice (×1.6), Fairy (×1.6).
Watch its Dark/Flying/Fighting/Normal/Psychic moves — counters like Kyurem (White) and Tyranitar (Mega) take super-effective damage from them.
Rainy weather boosts Electric moves ×1.2 — the best time to battle Yveltal.

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