Group size estimator

How many trainers do I need to invite?

The Estimator is already "trainers of this attacker needed to finish inside the timer", so this page does not invent a number: it reads it off the boss's own ranked counter list for three realistic parties and re-simulates each of them at every level from 20 to 50.

Raid bossTierIVsWeatherFriendshipDodgingShadow attackersMega attackersLegendary attackers

Invite 2 to be safe — 2 if everyone is prepared

At level 40, a party of Slaking's top six counters needs 1.31 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.62 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 3:50. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Slaking · Shadow Tier 3

normal

Weak to

fighting

Boss CP: 25,951
Boss HP: 4,000
Raid timer: 180s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Slaking at each attacker level
Attacker level	Six of the best counter	A prepared party	A mixed local group	Prepared solo time	Faints per timer
Level 20	2(1.97)	3(2.21)	3(2.69)	6:28	6.0
Level 25	2(1.42)	2(1.72)	3(2.28)	5:03	6.0
Level 30	2(1.24)	2(1.49)	2(1.88)	4:21	5.8
Level 35	2(1.07)	2(1.35)	2(1.73)	3:58	5.8
Level 40	2(1.06)	2(1.31)	2(1.62)	3:50	5.8
Level 45	2(1.04)	2(1.27)	2(1.55)	3:44	5.8
Level 50	2(1.01)	2(1.21)	2(1.49)	3:33	5.6

Whole trainers in bold, the raw estimator in brackets — 2.04 means two trainers is right on the line and three is comfortable.

Six of the best counter

Every trainer brings six copies of the single best counter — the theoretical floor.

2 trainers at level 40

Keldeo1.06

A prepared party

Each trainer brings the boss's top six counters, powered up and correctly TM'd.

2 trainers at level 40

Keldeo1.06
Lucario1.29
Kartana1.33
Terrakion1.36
Zamazenta (Crowned Shield)1.39
Urshifu (Rapid Strike)1.42

A mixed local group

Ranks 13-24: reasonable but unoptimised parties, which is what a public lobby usually is.

2 trainers at level 40

Latios1.54
Mewtwo1.56
Raikou1.55
Cobalion1.60
Galarian Zapdos1.63
Necrozma (Dusk Mane)1.59

The party these numbers assume

1. Keldeo

Low Kick + Secret Sword

2. Lucario

Force Palm + Aura Sphere

3. Kartana

Fury Cutter + Sacred Sword

4. Terrakion

Double Kick + Sacred Sword

5. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

6. Urshifu (Rapid Strike)

Counter + Dynamic Punch

See the full ranked counter list for Slaking · check a real lobby (win chance, who brings what) · make a share card of the top six

How this is worked out

The boss is ranked once at level 40 with rankCached (the same memoised call /raids makes), then the three bands — rank 1, ranks 1-6, ranks 13-24 — are re-simulated at each attacker level with an 8-run Monte Carlo each. Holding the party fixed and moving only its level is deliberate: it answers "what if my party were level 20" rather than "what would a level-20 player's completely different party be", and it is about ten times cheaper than re-ranking every attacker seven times. The Estimator itself is Pokebattler's definition, time to win including rejoin time divided by the raid timer.