#1004 · Gen 9 · Legendary

Chi Yu — Best counters

Weaknesses

fighting×1.60ground×1.60rock×1.60water×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Lucario (Mega)	fightingForce PalmELITE	fightingAura Sphere	Overcast	10013.9
2	Kyogre (Primal)	waterWaterfall	waterOrigin PulseELITE	Rainy	9312.9
3	Groudon (Primal)	groundMud Shot	groundPrecipice BladesELITE	Clear	9212.7
4	Blaziken (Mega)	fightingCounter	fightingFocus Blast	Overcast	8712.1
5	Heracross (Mega)	fightingCounter	fightingClose Combat	Overcast	8311.5
6	Diancie (Mega)	rockRock Throw	rockRock Slide	Partly Cloudy	8311.5
7	Garchomp (Mega)	groundMud Shot	groundEarthquake	Clear	8111.3
8	Alakazam (Mega)	fightingCounterELITE	fightingFocus Blast	Overcast	8111.2
9	Landorus (Therian)	groundMud Shot	groundSandsear StormELITE	Clear	7911.0
10	Swampert (Mega)	waterWater Gun	waterHydro CannonELITE	Rainy	7810.9
11	Pheromosa	fightingLow Kick	fightingFocus Blast	Overcast	7810.8
12	Lucario	fightingForce PalmELITE	fightingAura Sphere	Overcast	7610.6
13	Lopunny (Mega)	fightingDouble Kick	fightingFocus Blast	Overcast	7510.4
14	Gallade (Mega)	fightingLow Kick	fightingClose Combat	Overcast	7410.3
15	Tyranitar (Mega)	rockSmack DownELITE	rockStone Edge	Partly Cloudy	7310.2
16	Blastoise (Mega)	waterWater Gun	waterHydro CannonELITE	Rainy	7310.1
17	Gyarados (Mega)	waterWaterfall	waterHydro Pump	Rainy	7210.0
18	Latios (Mega)	dragonDragon Breath	fightingAura Sphere	Overcast · partial	7210.0
19	Terrakion	fightingDouble Kick	fightingSacred SwordELITE	Overcast	7210.0
20	Sharpedo (Mega)	waterWaterfall	waterHydro Pump	Rainy	719.9

Chi Yu is weak to Fighting (×1.6), Ground (×1.6), Rock (×1.6), Water (×1.6).
Watch its Fire/Dark moves — counters like Lucario (Mega) and Heracross (Mega) take super-effective damage from them.
Overcast weather boosts Fighting moves ×1.2 — the best time to battle Chi Yu.

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