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 3 to be safe — 3 if everyone is prepared

At level 40, a party of Spiritomb's top six counters needs 2.40 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.89 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 11:01. No level in this range makes it soloable with a prepared party.

Spiritomb · Tier 5

ghostdark

Weak to

fairy

Boss CP: 32,966
Boss HP: 15,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Spiritomb 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	3(2.99)	4(3.38)	5(4.28)	15:33	5.9
Level 25	3(2.68)	3(2.97)	4(3.68)	13:40	5.8
Level 30	3(2.34)	3(2.62)	4(3.21)	12:02	5.7
Level 35	3(2.26)	3(2.49)	4(3.06)	11:27	5.6
Level 40	3(2.18)	3(2.40)	3(2.89)	11:01	5.5
Level 45	3(2.05)	3(2.31)	3(2.79)	10:38	5.4
Level 50	2(2.00)	3(2.23)	3(2.70)	10:17	5.3

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

Zacian (Crowned Sword)2.18

A prepared party

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

3 trainers at level 40

Zacian (Crowned Sword)2.18
Eternatus2.38
Enamorus (Incarnate)2.41
Tapu Koko2.43
Zamazenta (Crowned Shield)2.46
Tapu Bulu2.51

A mixed local group

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

3 trainers at level 40

Necrozma (Dawn Wings)2.77
Kyurem (White)2.79
Zacian2.81
Togekiss2.82
Rayquaza2.82
Gardevoir2.85

The party these numbers assume

1. Zacian (Crowned Sword)

Metal Claw + Play Rough

2. Eternatus

Dragon Tail + Dynamax Cannon

3. Enamorus (Incarnate)

Fairy Wind + Dazzling Gleam

4. Tapu Koko

Volt Switch + Nature's Madness

5. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

6. Tapu Bulu

Bullet Seed + Nature's Madness

See the full ranked counter list for Spiritomb · 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.