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 — 2 if everyone is prepared

At level 40, a party of Scream Tail's top six counters needs 1.98 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.71 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 9:05. No level in this range makes it soloable with a prepared party. A duo works from level 40.

Scream Tail · Tier 5

fairypsychic

Weak to

poisonghoststeel

Boss CP: 29,762
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 Scream Tail 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(2.22)	3(2.62)	4(3.61)	12:02	2.9
Level 25	3(2.05)	3(2.36)	4(3.22)	10:52	2.2
Level 30	2(1.83)	3(2.13)	3(2.93)	9:48	1.8
Level 35	2(1.79)	3(2.06)	3(2.81)	9:28	1.7
Level 40	2(1.67)	2(1.98)	3(2.71)	9:05	1.5
Level 45	2(1.63)	2(1.91)	3(2.64)	8:47	1.4
Level 50	2(1.60)	2(1.86)	3(2.54)	8:35	1.4

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

Zacian (Crowned Sword)1.67

A prepared party

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

2 trainers at level 40

Zacian (Crowned Sword)1.67
Zamazenta (Crowned Shield)1.77
Necrozma (Dusk Mane)1.81
Necrozma (Dawn Wings)1.90
Blacephalon2.30
Eternatus2.42

A mixed local group

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

3 trainers at level 40

Hisuian Zoroark2.61
Nihilego2.65
Dragapult2.66
Cursola2.70
Gholdengo2.70
Hoopa2.70

The party these numbers assume

1. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

2. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

3. Necrozma (Dusk Mane)

Metal Claw + Sunsteel Strike

4. Necrozma (Dawn Wings)

Metal Claw + Moongeist Beam

5. Blacephalon

Astonish + Shadow Ball

6. Eternatus

Poison Jab + Sludge Bomb

See the full ranked counter list for Scream Tail · 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.