#0093 · Gen 1

Haunter — Best counters

Weaknesses

ground×1.60ghost×1.60psychic×1.60dark×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Alakazam (Mega)	psychicConfusion	psychicPsychicELITE	Windy	10013.4
2	Gengar (Mega)	ghostLickELITE	ghostShadow Ball	Fog	9713.0
3	Groudon (Primal)	groundMud Shot	groundPrecipice BladesELITE	Clear	9512.7
4	Gardevoir (Mega)	psychicConfusion	psychicPsychic	Windy	8911.9
5	Gallade (Mega)	psychicConfusion	psychicPsychic	Windy	8911.9
6	Absol (Mega)	darkSnarl	darkBrutal SwingELITE	Fog	8811.8
7	Deoxys (Attack)	psychicZen Headbutt	darkDark Pulse	Fog · partial	8811.7
8	Mewtwo	psychicConfusion	psychicPsystrikeELITE	Windy	8711.6
9	Latios (Mega)	psychicZen Headbutt	psychicPsychic	Windy	8611.5
10	Hoopa (Unbound)	psychicConfusion	psychicPsychic	Windy	8511.3
11	Banette (Mega)	ghostHex	ghostShadow Ball	Fog	8411.3
12	Garchomp (Mega)	groundMud Shot	groundEarthquake	Clear	8411.3
13	Blacephalon	ghostAstonish	ghostShadow Ball	Fog	8311.1
14	Landorus (Therian)	groundMud Shot	groundSandsear StormELITE	Clear	8211.0
15	Tyranitar (Mega)	darkBite	darkBrutal Swing	Fog	8110.9
16	Houndoom (Mega)	darkSnarl	darkFoul Play	Fog	7910.5
17	Metagross (Mega)	psychicZen Headbutt	psychicPsychic	Windy	7710.3
18	Darkrai	darkSnarl	ghostShadow Ball	Fog	7410.0
19	Latias (Mega)	psychicZen Headbutt	psychicPsychic	Windy	749.9
20	Alakazam	psychicConfusion	psychicPsychicELITE	Windy	749.9

Haunter is weak to Ground (×1.6), Ghost (×1.6), Psychic (×1.6), Dark (×1.6).
Watch its Ghost/Dark/Poison/Ice moves — counters like Alakazam (Mega) and Gengar (Mega) take super-effective damage from them.
Windy weather boosts Psychic moves ×1.2 — the best time to battle Haunter.

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