#0785 · Gen 7 · Legendary

Tapu Koko — Best counters

Weaknesses

	Pokémon	Fast move	Charged move	Weather	Score
1	Groudon (Primal)	groundMud Shot	groundPrecipice BladesELITE	Clear	10012.7
2	Garchomp (Mega)	groundMud Shot	groundEarthquake	Clear	8911.3
3	Beedrill (Mega)	poisonPoison Jab	poisonSludge Bomb	Overcast	8811.2
4	Landorus (Therian)	groundMud Shot	groundSandsear StormELITE	Clear	8611.0
5	Gengar (Mega)	ghostLickELITE	poisonSludge Bomb	Overcast · partial	8510.8
6	Eternatus	poisonPoison Jab	poisonSludge Bomb	Overcast	8010.2
7	Groudon	groundMud Shot	groundPrecipice BladesELITE	Clear	769.7
8	Naganadel	poisonPoison Jab	poisonSludge Bomb	Overcast	769.7
9	Swampert (Mega)	groundMud Shot	groundEarthquake	Clear	749.4
10	Eternatus (Eternamax)	poisonPoison Jab	poisonSludge Bomb	Overcast	739.2
11	Excadrill	groundMud Slap	groundEarthquake	Clear	729.2
12	Nihilego	poisonPoison Jab	poisonSludge Bomb	Overcast	729.2
13	Mamoswine	groundMud Slap	groundHigh Horsepower	Clear	719.0
14	Deoxys (Attack)	poisonPoison Jab	electricZap Cannon	Rainy · partial	719.0
15	Roserade	poisonPoison Jab	poisonSludge Bomb	Overcast	708.9
16	Regigigas	normalHidden Power	normalCrush GripELITE	Partly Cloudy	698.8
17	Rhyperior	groundMud Slap	groundEarthquake	Clear	688.7
18	Garchomp	groundMud Shot	groundEarthquake	Clear	688.7
19	Landorus (Incarnate)	groundMud Shot	groundEarth Power	Clear	678.5
20	Revavroom	poisonPoison Jab	poisonGunk Shot	Overcast	668.4

Tapu Koko is weak to Poison (×1.6), Ground (×1.6).
Watch its Electric/Normal/Fairy/Flying moves — counters like Garchomp (Mega) and Beedrill (Mega) take super-effective damage from them.
Clear weather boosts Ground moves ×1.2 — the best time to battle Tapu Koko.

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