Mega Slowbro counters

#0080

water psychicPrimal

Lobby CP

59,342

22,500

Timer

5:00

Attack

188

Defense

216

Difficulty

3.18

Pokebattler scale

Beating Mega Slowbro should take 3 trainers with level 40 counters. Caught CP 1,382-1,454 (you catch Slowbro).

Weak tobug1.6xghost1.6xgrass1.6xelectric1.6xdark1.6x

Who to bring

IncludeMega Legendary Shadow

Improve your raidweather · friendship · Mega in the lobby · Party Power · Adventure EffectsShow ▾

Weather

★ boosts a type this boss is weak to

No boost Sunny or clear ★Rainy ★Partly cloudy Cloudy Windy Snow Fog ★

Friendship

every trainer in the lobby who is your friend

None Good friend (+3%)Great friend (+5%)Ultra friend (+7%)Best friend (+10%)

Mega in the lobby

a Mega boosts every trainer's attacks: 1.3x of its own type, 1.1x of others

Try an Electric Mega — most top counters attack with Electric

Party Power

Party Play: the charged move after a full meter does 2x

Off 2 trainers 3 trainers 4 trainers

Adventure Effects

only these three change a raid

Behemoth Blade (+10% attack)Behemoth Bash (+10% defense)Dynamic Punch+ (+15% attack vs Mega)

Of the game's eleven Adventure Effects only Behemoth Blade (Crowned Sword Zacian), Behemoth Bash (Crowned Shield Zamazenta) and Dynamic Punch+ (Mega Mewtwo X) change a raid; Roar of Time, Spacial Rend, Freeze Shock, Ice Burn, Sunsteel Strike, Moongeist Beam, Future Sight+ and Dynamax Cannon act outside raids. Dynamic Punch+ only counts against a Mega boss, so it changes nothing here. Sources: the full list, Behemoth Blade / Bash, Dynamic Punch+.

Best counters

Mega, Legendary, Shadow · level 40

The best Mega Slowbro counters are Mega Raichu Y, Necrozma (Dawn Wings), Shadow Darkrai, Shadow Thundurus (Therian), Shadow Hydreigon & Shadow Giratina (Origin).

Suggested party of sixat most one Mega

M. Raichu Y
Necrozma (Dawn Wings)
S. Darkrai
S. Thundurus (Therian)
S. Hydreigon
S. Giratina (Origin)

9 more Megas ranked inside the top six — a party can hold only one Mega, so the best one stays and the next non-Mega takes the slot.

Ranked by Estimator (trainers needed); small print: time to winOrder byEstimatorOverall %

1Mega Raichu YMegapartyThunder Shock / Zap Cannon+2.9713:49
2Mega HoundoomMegaSnarl / Dark Pulse+3.1514:38
3Necrozma (Dawn Wings)LegendarypartyShadow Claw / Moongeist Beam3.1814:46
4Mega Raichu XMegaThunder Shock / Volt Tackle+3.2114:55
5Mega BeedrillMegaBug Bite / Fell Stinger+3.2214:58
6Mega ChesnaughtMegaVine Whip / Seed Bomb+3.3715:40
7Mega GengarMegaLick / Shadow Ball3.4416:00
8Mega SceptileMegaFury Cutter / Frenzy Plant3.5416:27
9Shadow DarkraiShadowLegendarypartySnarl / Foul Play3.5616:32
10Shadow Thundurus (Therian)ShadowLegendarypartyVolt Switch / Wildbolt Storm3.5616:34
14Shadow HydreigonShadowpartyBite / Brutal Swing3.7717:32
15Shadow Giratina (Origin)ShadowLegendarypartyShadow Claw / Shadow Force3.7917:36

More orders under All settings (Sort by). The top 15 in detail.

Build and order a party of six →Plan your raid lobby →

Best from your Pokebox

Pokebox

The Pokebox saved in this browser · each at its own level, IVs and moves.

Search bosses

Type a name, then Enter or click a result

Raid tier — Primal Raid

Super Mega Legendary Super Mega Primal Mega Legendary Mega Elite Shadow Tier 5 Tier 5 Shadow Tier 3 Tier 3 Shadow Tier 1 Tier 1 Tier 4 Tier 2

Related countersGalarian Slowbro Slowbro

Raid alerts…

Top 15 Mega Slowbro counters in detail

Click a row for damage per move, breakpoints and the energy cycle. Click a column to sort. All 30 ranked attackers, with every column, are under All settings.

Trainers3small group

#	Attacker	Moveset
1	Mega Raichu Yelectricjoint top pick	electricThunder ShockelectricZap Cannon+	3,780	13:49	2.97	6.0	36.7%
2	Mega Houndoomdarkfire	darkSnarldarkDark Pulse+	3,842	14:38	3.15	6.0	34.6%
3	Necrozma (Dawn Wings)psychicghost	ghostShadow ClawghostMoongeist Beam	4,099	14:46	3.18	5.3	34.3%
4	Mega Raichu Xelectric	electricThunder ShockelectricVolt Tackle+	3,510	14:55	3.21	6.0	34.0%
5	Mega Beedrillbugpoison	bugBug BitebugFell Stinger+	3,383	14:58	3.22	5.9	33.9%
6	Mega Chesnaughtgrassfighting	grassVine WhipgrassSeed Bomb+	4,093	15:40	3.37	5.6	32.4%
7	Mega Gengarghostpoison	ghostLickghostShadow Ball	4,336	16:00	3.44	5.7	31.7%
8	Mega Sceptilegrassdragon	bugFury CuttergrassFrenzy Plant	4,056	16:27	3.54	5.8	30.8%
9	Shadow Darkraidark	darkSnarldarkFoul Play	3,739	16:32	3.56	6.0	30.7%
10	Shadow Thundurus (Therian)electricflying	electricVolt SwitchelectricWildbolt Storm	3,659	16:34	3.56	6.0	30.6%
11	Mega Mewtwo Ypsychic	psychicPsycho CutghostShadow Ball	6,428	16:43	3.60	5.6	30.3%
12	Mega Mewtwo Xpsychicfighting	psychicPsycho CutghostShadow Ball	6,112	17:17	3.72	5.7	29.4%
13	Mega Tyranitarrockdark	darkBitedarkBrutal Swing	5,347	17:21	3.73	5.5	29.2%
14	Shadow Hydreigondarkdragon	darkBitedarkBrutal Swing	3,625	17:32	3.77	6.0	28.9%
15	Shadow Giratina (Origin)ghostdragon	ghostShadow ClawghostShadow Force	3,683	17:36	3.79	5.5	28.8%

Ordered by Estimator alone, fewest trainers needed first. . The place badge names each row's Overall place on hover.

Times are one trainer with six copies of that attacker, level 40 at 15/15/15, no weather, no friendship, no dodging, Shadow / Mega / Legendary attackers hidden — the same defaults pokebattler.com's own counter pages open with. Open the full counter tool to change any of them. "Details" opens the per-move damage, breakpoints and energy cycle against Mega Slowbro.

Estimator is how many trainers of this strength the fight needs. Power is the share of Mega Slowbro's HP that six of that attacker remove inside one raid timer, so over 100% means they finish it with time to spare. Faints is how many of the six go down inside that timer.

Hardest movesets to raid against

The same boss is a different fight depending on what it knows. Each row re-simulates the top 6 counters above against one specific moveset; the list is ordered hardest first, and clicking a row filters the whole page to that moveset — the ranking, the estimator and the share link all follow.

Boss moveset	Win % (3)	Overall	Power	Time to win	Faints	Estimator
Random (any moveset)showing	32%	43%	31.5%	16:07	5.8	3.47
Confusion / Ice Beam	32%	33%	30.6%	16:33	6.0	3.56
Water Gun / Ice Beam	25%	33%	30.6%	16:33	6.0	3.56
Water Gun / Psychic	21%	42%	30.9%	16:24	6.0	3.53
Confusion / Scald	24%	44%	31.1%	16:20	6.0	3.51
Water Gun / Scald	21%	46%	31.3%	16:11	5.9	3.48
Confusion / Psychic	32%	44%	31.5%	16:07	6.0	3.47
Confusion / Water Pulse	33%	46%	31.5%	16:06	6.0	3.46
Water Gun / Water Pulse	33%	48%	31.7%	15:60	5.9	3.44
Water Gun / Drain Punch	36%	79%	32.4%	15:39	4.8	3.37
Confusion / Drain Punch	49%	66%	32.6%	15:33	5.2	3.34

Measured over the top 6 attackers on the list above rather than by re-ranking the whole roster once per moveset — the ordering is what the table is for, and a full re-rank per moveset would cost ten times the page's whole simulation budget. Win % is the share of runs 3 trainers of those attackers finish inside the raid timer. Overall is Pokebattler's published blend on its own absolute scale (higher is easier), not a percentage of the best row the way the ranked table's Overall column is — which is why an easy boss reads well above 100% here.

Simulating each boss moveset…

Mega Slowbro weaknesses and resistances

Every one of the 18 attacking types against this boss's typing. GO multipliers: 1.6x super effective, 2.56x doubly, 0.625x resisted, 0.39x doubly resisted.

bug1.6x ghost1.6x grass1.6x electric1.6x dark1.6x normal1x flying1x poison1x ground1x rock1x dragon1x fairy1x fighting0.63x steel0.63x fire0.63x water0.63x psychic0.63x ice0.63x

Weak (5)
Neutral (7)
Resists (6)

It resists fighting0.625xsteel0.625xfire0.625xwater0.625xpsychic0.625xice0.625x— bringing one of those is throwing damage away.

What Mega Slowbro throws at you

Its standard movepool, with the damage window a dodge has to beat.

Fast moves

Move	Power	Energy	Duration	Hits at
psychicConfusionSTAB	19	+14	1.5s	0.50s
waterWater GunSTAB	5	+5	0.5s	0.30s

Charged moves

Move	Power	Energy	Duration	Hits at
psychicPsychicSTAB	95	-50	3.0s	1.50s
iceIce Beam	95	-50	3.5s	1.50s
waterWater PulseSTAB	65	-50	3.0s	2.00s
waterScaldSTAB	75	-50	3.5s	1.10s
fightingDrain Punch	50	-33	2.5s	1.10s

Catch CP

What the encounter after the fight can hand you.

IV spread	CP at L20	CP at L25 (weather boosted)
10/10/10floor	1,382	1,728
11/11/11	1,397	1,746
12/12/12	1,411	1,764
13/13/13	1,425	1,782
14/14/14	1,439	1,799
15/15/15hundo	1,454	1,817

Caught CP range 1,382 - 1,454, or 1,728 - 1,817 when the weather boosts it.

A raid encounter is level 20 (level 25 weather boosted) and cannot roll an IV below 10/10/10. Anything outside the first range is not this raid's reward.

When it is in raids

From the raid schedule, refreshed daily.

Mega Slowbro is not on the raid schedule right now. The simulation above is still exact for the tier chosen — any boss can be simulated, current or not.

All settings

Primal: 22,500 HP, 5:00 timer, boss Attack 188 / Defense 216 (15/15/15 at tier CPM 0.79).

Raid bossAttacker levelAttacker IVsWeatherFriendshipDodgingTrainers in the lobbyMega in the lobbyParty Play trainersBoss fast moveBoss charged moveSort by

Attackers allowed

ShadowMega and PrimalLegendary, Mythical, Ultra BeastLegacy and Elite TM moves

Share these exact settings

Every column, and pokebattler.com's own rank

On a phone the list shows estimator, time to win and faints. Overall, Power, win chance, CP, DPS and TDO appear on a wider screen.

#	Attacker	Moveset	Overall	Power	Est.Estimator	TimeTime to win	Faints	Win % (3)	CP	DPS	TDO
1	Mega Raichu Y electricmega Thunder Shock / Zap Cannon+	Thunder Shock / Zap Cannon++35 more movesets	100%	36.7%	2.97	13:49	43.2	98%	3,780	29.1	559
2	Mega Houndoom darkfiremega Snarl / Dark Pulse+	Snarl / Dark Pulse++17 more movesets	96%	34.6%	3.15	14:38	35.3	78%	3,842	27.0	745
3	Necrozma (Dawn Wings) psychicghost Shadow Claw / Moongeist Beam	Shadow Claw / Moongeist Beam+14 more movesets	100%	34.3%	3.18	14:46	23.9	74%	4,099	26.3	1168
4	Mega Raichu X electricmega Thunder Shock / Volt Tackle+	Thunder Shock / Volt Tackle++35 more movesets	94%	34.0%	3.21	14:55	39.0	66%	3,510	26.6	613
5	Mega Beedrill bugpoisonmega Bug Bite / Fell Stinger+	Bug Bite / Fell Stinger++23 more movesets	90%	33.9%	3.22	14:58	51.6	54%	3,383	27.1	561
6	Mega Chesnaught grassfightingmega Vine Whip / Seed Bomb+	Vine Whip / Seed Bomb++20 more movesets	92%	32.4%	3.37	15:40	28.4	6%	4,093	24.9	968
7	Mega Gengar ghostpoisonmega Lick / Shadow Ball	Lick / Shadow Ball+31 more movesets	86%	31.7%	3.44	15:60	44.8	16%	4,336	24.9	683
8	Mega Sceptile grassdragonmega Fury Cutter / Frenzy Plant	Fury Cutter / Frenzy Plant+11 more movesets	83%	30.8%	3.54	16:27	45.8	0%	4,056	24.3	763
9	Shadow Darkrai darkshadow Snarl / Foul Play	Snarl / Foul Play+14 more movesets	84%	30.7%	3.56	16:32	40.2	0%	3,739	23.9	599
10	Shadow Thundurus (Therian) electricflyingshadow Volt Switch / Wildbolt Storm	Volt Switch / Wildbolt Storm+9 more movesets	82%	30.6%	3.56	16:34	52.7	8%	3,659	24.3	497
11	Mega Mewtwo Y psychicmega Psycho Cut / Shadow Ball	Psycho Cut / Shadow Ball+26 more movesets	88%	30.3%	3.60	16:43	24.8	0%	6,428	23.2	981
12	Mega Mewtwo X psychicfightingmega Psycho Cut / Shadow Ball	Psycho Cut / Shadow Ball+26 more movesets	83%	29.4%	3.72	17:17	30.2	0%	6,112	22.5	819
13	Mega Tyranitar rockdarkmega Bite / Brutal Swing	Bite / Brutal Swing+15 more movesets	83%	29.2%	3.73	17:21	29.3	0%	5,347	22.4	867
14	Shadow Hydreigon darkdragonshadow Bite / Brutal Swing	Bite / Brutal Swing+9 more movesets	80%	28.9%	3.77	17:32	37.5	0%	3,625	22.3	695
15	Shadow Giratina (Origin) ghostdragonshadow Shadow Claw / Shadow Force	Shadow Claw / Shadow Force+7 more movesets	81%	28.8%	3.79	17:36	31.5	0%	3,683	22.1	916
16	Mega Absol darkmega Snarl / Brutal Swing	Snarl / Brutal Swing+9 more movesets	76%	28.8%	3.79	17:37	56.0	0%	3,301	22.8	439
17	Shadow Tyranitar rockdarkshadow Bite / Brutal Swing	Bite / Brutal Swing+15 more movesets	77%	28.5%	3.82	17:46	45.2	0%	3,834	22.3	572
18	Shadow Raikou electricshadow Thunder Shock / Wild Charge	Thunder Shock / Wild Charge+9 more movesets	76%	28.1%	3.88	18:03	45.3	0%	3,452	21.9	524
19	Mega Heracross bugfightingmega Fury Cutter / Megahorn	Fury Cutter / Megahorn+17 more movesets	76%	28.1%	3.89	18:05	43.4	0%	4,814	21.9	633
20	Shadow Absol darkshadow Snarl / Brutal Swing	Snarl / Brutal Swing+9 more movesets	73%	27.9%	3.91	18:11	64.4	0%	2,526	22.2	373
21	Zeraora electric Volt Switch / Plasma Fists	Volt Switch / Plasma Fists+9 more movesets	75%	27.7%	3.94	18:19	42.8	0%	3,419	21.5	555
22	Kartana grasssteel Razor Leaf / Leaf Blade	Razor Leaf / Leaf Blade+14 more movesets	74%	27.5%	3.97	18:26	47.6	0%	3,677	21.5	505
23	Shadow Sceptile grassshadow Fury Cutter / Frenzy Plant	Fury Cutter / Frenzy Plant+11 more movesets	73%	27.5%	3.97	18:28	55.5	0%	2,757	21.7	461
24	Regieleki electric Thunder Shock / Thunder Cage	Thunder Shock / Thunder Cage+11 more movesets	72%	27.4%	3.99	18:32	60.4	0%	2,803	21.8	400
25	Shadow Chandelure ghostfireshadow Hex / Shadow Ball	Hex / Shadow Ball+19 more movesets	71%	27.3%	4.00	18:36	61.3	0%	3,268	21.7	458
26	Shadow Electivire electricshadow Thunder Shock / Wild Charge	Thunder Shock / Wild Charge+9 more movesets	71%	27.2%	4.02	18:40	60.5	0%	3,079	21.5	400
27	Mega Rayquaza dragonflyingmega Dragon Tail / Dragon Ascent	Dragon Tail / Dragon Ascent+11 more movesets	75%	27.0%	4.04	18:46	36.5	0%	5,713	20.8	814
28	Mega Banette ghostmega Hex / Shadow Ball	Hex / Shadow Ball+5 more movesets	71%	26.8%	4.07	18:54	55.3	0%	3,594	21.2	500
29	Xurkitree electric Thunder Shock / Discharge	Thunder Shock / Discharge+7 more movesets	71%	26.7%	4.08	18:59	54.7	0%	3,937	21.0	442
30	Mega Manectric electricmega Thunder Fang / Wild Charge	Thunder Fang / Wild Charge+14 more movesets	71%	26.6%	4.10	19:04	51.3	0%	3,580	20.8	470

How accurate is this? Same top pick as pokebattler.com on 26 of 27 lists checked, 90% of its top tens shared; weakest on Mewtwo's default list (7 of 10).

Ranking. Our full ranking against the page pokebattler.com serves for the same boss and settings, on 27 boss and filter combinations read live (2026-10-04): 242 of 270 top-ten places shared, the same #1 on 26. On the six fixed reference bosses (read 2026-10-03): 85% top-ten overlap with its default filters, 83% with Shadow, Mega and Legendary on. A close top three is shown as a tie because the order inside it is below what we can measure.

Time to win. Graded with Pokebattler's own movesets against every boss moveset, average per boss: Tier 1 and 3 +0.1% to +1.2%; Tier 5 −2.9% to +1.3%; Mega −1.1% to +2.6%; Shadow Tier 5 −1.8% to +0.3%. One attacker can be off by more: median 1.6%, worst 15%, RMS per boss moveset 2.05%.

Known weak spots.

Mewtwo (Tier 5, default filters) shares 7 of Pokebattler's top 10: Absol, Incineroar and Salamence sit just outside ours, Polteageist, Cursola and Hisuian Typhlosion just inside.
Groudon (Tier 5, default filters) shares 7 of 10; its Grass and Water counters run 2-6% fast here.
Tier 5 times run about 2-3% fast for attackers that faint often, and 2-3% slow on Mega Charizard Y and Mega Beedrill, whose counters resist the boss.
Tier 1 lists are the least checked: Combee (Tier 1) shares only 3 of Pokebattler's top 10, with Gigalith first here where Pokebattler puts Rhyperior.

Boss-by-boss accuracy report.

Ranked 30 attackers in 1.9 s (50 Monte Carlo runs each, seed 1). The same ranking as JSON: /api/raids/rank.