Weather planner

Today's weather — who gains, and by how much?

Weather boost is 1.2x on every move of a boosted type — yours and the boss's. That is why the answer is not simply "whichever weather boosts the super-effective type": each of the eight states below is a fresh Monte Carlo of the whole counter pool, not a multiplier applied to a DPS number.

Raid bossTierWeather right nowAttacker levelIVsFriendshipShadow attackersMega attackers

In fog, bring Necrozma (Dawn Wings)

Fog boosts dark, ghost. Against Mewtwo the whole counter pool is +12.1% compared with no boost, and the best pick becomes Necrozma (Dawn Wings) at 6:28. Mewtwo has no move of a boosted type, so this weather is pure upside. The best weather for this boss overall is fog (+12.1%), the worst is cloudy (-0.8%).

Mewtwo · Tier 5

psychic

Weak to

bugghostdark

Counters swept: 18
Battles run: 720

All eight weather states

Scroll sideways for the pool-wide change.

Best counter for Mewtwo in each weather
Weather	Boosts	Best counter	Its time to win	Its change	Whole pool	Boss boosted too?
Extreme / no boost	nothing	Necrozma (Dawn Wings)	7:44	0.0%	0.0%	—
Sunny or clear	grassgroundfire	Necrozma (Dawn Wings)	7:45	-0.1%	-0.4%	yes — Mewtwo gains too
Rainy	waterelectricbug	Necrozma (Dawn Wings)	7:38	+1.2%	+0.3%	yes — Mewtwo gains too
Partly cloudy	normalrock	Necrozma (Dawn Wings)	7:44	0.0%	0.0%	no
Cloudy	fairyfightingpoison	Necrozma (Dawn Wings)	7:43	+0.3%	-0.8%	yes — Mewtwo gains too
Windy	dragonflyingpsychic	Necrozma (Dawn Wings)	7:47	-0.7%	-0.4%	yes — Mewtwo gains too
Snow	icesteel	Necrozma (Dawn Wings)	7:47	-0.5%	+2.7%	yes — Mewtwo gains too
Fogright now	darkghost	Necrozma (Dawn Wings)	6:28	+16.4%	+12.1%	no

Every counter, every weather

Scroll sideways through the eight weather columns.

Time to win for each counter in each weather
Counter	Moveset	Extreme	Sunny	Rainy	Partly	Cloudy	Windy	Snow	Fog	Best in
Necrozma (Dawn Wings)	Psycho Cut + Moongeist Beam	464s	465s	458s	464s	463s	467s	467s	388s	Fog
Blacephalon	Astonish + Shadow Ball	583s	586s	577s	583s	590s	700s	589s	482s	Fog
Lunala	Shadow Claw + Shadow Ball	597s	596s	604s	597s	597s	594s	593s	489s	Fog
Hydreigon	Bite + Brutal Swing	628s	628s	628s	628s	668s	630s	626s	511s	Fog
Darkrai	Snarl + Foul Play	616s	612s	622s	616s	616s	617s	620s	520s	Fog
Chandelure	Hex + Shadow Ball	621s	623s	632s	621s	619s	621s	622s	522s	Fog
Gholdengo	Hex + Shadow Ball	634s	653s	633s	634s	646s	629s	638s	532s	Fog
Dragapult	Astonish + Shadow Ball	640s	643s	639s	640s	642s	638s	649s	533s	Fog
Tyranitar	Bite + Brutal Swing	662s	662s	668s	662s	662s	663s	656s	542s	Fog
Giratina (Origin)	Shadow Claw + Shadow Force	628s	630s	630s	628s	628s	624s	627s	542s	Fog
Hoopa (Unbound)	Astonish + Shadow Ball	654s	652s	683s	654s	654s	651s	665s	548s	Fog
Hoopa	Astonish + Shadow Ball	664s	660s	690s	664s	662s	661s	660s	551s	Fog
Kyurem (Black)	Shadow Claw + Freeze Shock	630s	628s	628s	630s	703s	633s	564s	552s	Fog
Necrozma (Dusk Mane)	Shadow Claw + Sunsteel Strike	634s	651s	639s	634s	634s	633s	579s	596s	Snow
Eternatus	Poison Jab + Dynamax Cannon	632s	630s	634s	632s	592s	555s	636s	632s	Windy
Zacian (Crowned Sword)	Metal Claw + Behemoth Blade	653s	658s	664s	653s	653s	662s	553s	653s	Snow
Zamazenta (Crowned Shield)	Metal Claw + Behemoth Bash	660s	659s	659s	660s	655s	657s	545s	660s	Snow
Volcarona	Bug Bite + Bug Buzz	676s	689s	551s	676s	681s	680s	674s	676s	Rainy

Times in seconds, the best weather for each counter in bold green. Rows are ordered by their time in fog.

How this is worked out

The pool is Mewtwo's top 18 counters with no weather boost, from the same rankCached call /raids makes; each of them is then re-built with attackerCombatant and re-run through a 5-run monteCarlo in each of the eight weather states, holding the moveset and the seed fixed so the comparison between cells is clean. That is the honest limitation to know about: an attacker outside the unboosted top 18 cannot appear here even if a weather would have lifted it into the list. Weather is 1.2x per boosted move (WEATHER_MULTIPLIER) and applies to the boss as well as to you.