#0100 · Gen 1

Voltorb (Hisui) — Best counters

Weaknesses

poison×1.60bug×1.60fire×1.60ice×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Blaziken (Mega)	fireFire Spin	fireBlast BurnELITE	Clear	10013.2
2	Charizard (Mega Y)	fireFire Spin	fireBlast BurnELITE	Clear	9712.8
3	Blacephalon	fireIncinerate	fireOverheat	Clear	8911.7
4	Eternatus	poisonPoison Jab	dragonDynamax CannonELITE	Windy · partial	8711.5
5	Reshiram	fireFire Fang	fireFusion FlareELITE	Clear	8511.2
6	Beedrill (Mega)	poisonPoison Jab	poisonSludge Bomb	Overcast	8511.2
7	Kyurem (White)	iceIce Fang	fireFusion Flare	Clear · partial	8411.1
8	Charizard (Mega X)	fireFire Spin	fireBlast BurnELITE	Clear	8310.9
9	Gengar (Mega)	ghostLickELITE	poisonSludge Bomb	Overcast · partial	8210.8
10	Heracross (Mega)	bugStruggle Bug	bugMegahorn	Rainy	8210.8
11	Pheromosa	bugBug Bite	bugBug Buzz	Rainy	8110.6
12	Eternatus (Eternamax)	poisonPoison Jab	dragonDynamax CannonELITE	Windy · partial	7910.4
13	Chandelure	fireFire Spin	fireOverheat	Clear	7810.3
14	Houndoom (Mega)	fireFire Fang	fireFire Blast	Clear	7810.3
15	Volcarona	fireFire Spin	fireOverheat	Clear	7610.0
16	Darmanitan (Standard)	fireFire Fang	fireOverheat	Clear	7610.0
17	Groudon (Primal)	groundMud Shot	fireFire Blast	Clear	759.9
18	Pinsir (Mega)	bugBug Bite	bugX Scissor	Rainy	749.8
19	Naganadel	poisonPoison Jab	poisonSludge Bomb	Overcast	749.7
20	Ho Oh	fireIncinerate	fireSacred FireELITE	Clear	739.6

Voltorb (Hisui) is weak to Poison (×1.6), Bug (×1.6), Fire (×1.6), Ice (×1.6).
Watch its Electric/Normal/Grass moves — counters like Charizard (Mega Y) and Pinsir (Mega) take super-effective damage from them.
Clear weather boosts Fire moves ×1.2 — the best time to battle Voltorb (Hisui).

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