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 5 to be safe — 4 if everyone is prepared

At level 40, a party of Slaking's top six counters needs 3.27 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.08 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 15:04. No level in this range makes it soloable with a prepared party.

Slaking · Elite

normal

Weak to

fighting

Boss CP: 58,030
Boss HP: 20,000
Raid timer: 300s
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	6(5.32)	7(6.01)	8(7.08)	27:39	6.0
Level 25	5(4.99)	6(5.37)	6(5.94)	24:43	6.0
Level 30	4(3.18)	5(4.00)	5(4.90)	18:25	6.0
Level 35	4(3.11)	4(3.65)	5(4.43)	16:47	6.0
Level 40	3(2.57)	4(3.27)	5(4.08)	15:04	6.0
Level 45	3(2.43)	4(3.16)	4(3.86)	14:32	6.0
Level 50	3(2.36)	4(3.08)	4(3.77)	14:11	6.0

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.

3 trainers at level 40

Keldeo2.57

A prepared party

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

4 trainers at level 40

Keldeo2.57
Lucario3.26
Terrakion3.33
Zamazenta (Crowned Shield)3.49
Eternatus3.49
Urshifu (Rapid Strike)3.50

A mixed local group

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

5 trainers at level 40

Gallade3.88
Virizion3.95
Cobalion3.97
Kyurem (White)4.06
Regigigas4.03
Buzzwole4.10

The party these numbers assume

1. Keldeo

Low Kick + Secret Sword

2. Lucario

Force Palm + Aura Sphere

3. Terrakion

Double Kick + Sacred Sword

4. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

5. Eternatus

Poison Jab + Dynamax Cannon

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.