#0178 · Gen 2

Xatu — Best counters

Weaknesses

rock×1.60ghost×1.60electric×1.60ice×1.60dark×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Regieleki	normalLock On	electricThunder CageELITE	Rainy · partial	10013.3
2	Gengar (Mega)	ghostLickELITE	ghostShadow Ball	Fog	9713.0
3	Absol (Mega)	darkSnarl	darkBrutal SwingELITE	Fog	8911.8
4	Diancie (Mega)	rockRock Throw	rockRock Slide	Partly Cloudy	8611.5
5	Banette (Mega)	ghostHex	ghostShadow Ball	Fog	8511.3
6	Blacephalon	ghostAstonish	ghostShadow Ball	Fog	8311.1
7	Tyranitar (Mega)	rockSmack DownELITE	darkBrutal Swing	Fog · partial	8311.0
8	Manectric (Mega)	electricThunder Fang	electricWild Charge	Rainy	8211.0
9	Xurkitree	electricThunder Shock	electricDischarge	Rainy	8110.8
10	Kyurem (White)	iceIce Fang	iceBlizzard	Snow	8110.8
11	Houndoom (Mega)	darkSnarl	darkFoul Play	Fog	7910.5
12	Ampharos (Mega)	electricVolt Switch	electricZap Cannon	Rainy	7910.5
13	Zekrom	electricCharge Beam	electricFusion BoltELITE	Rainy	7810.3
14	Deoxys (Attack)	poisonPoison Jab	electricZap Cannon	Rainy · partial	7610.1
15	Darkrai	darkSnarl	ghostShadow Ball	Fog	7510.0
16	Kyurem (Black)	ghostShadow Claw	electricFusion Bolt	Rainy · partial	749.9
17	Chandelure	ghostHex	ghostShadow Ball	Fog	749.8
18	Aerodactyl (Mega)	rockRock Throw	rockRock Slide	Partly Cloudy	749.8
19	Zoroark (Hisui)	darkSnarl	ghostShadow Ball	Fog	739.8
20	Gengar	ghostLickELITE	ghostShadow Ball	Fog	739.7

Xatu is weak to Rock (×1.6), Ghost (×1.6), Electric (×1.6), Ice (×1.6), Dark (×1.6).
Watch its Flying/Dark/Ghost/Psychic moves — counters like Gengar (Mega) and Banette (Mega) take super-effective damage from them.
Rainy weather boosts Electric moves ×1.2 — the best time to battle Xatu.

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