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 Froslass's top six counters needs 1.33 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.82 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 6:08. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Froslass · Tier 5

iceghost

Weak to

rockghoststeelfiredark

Boss CP: 29,261
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 Froslass 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(1.65)	3(2.06)	3(2.63)	9:29	6.0
Level 25	2(1.42)	2(1.75)	3(2.28)	8:04	5.9
Level 30	2(1.28)	2(1.50)	3(2.02)	6:54	5.7
Level 35	2(1.22)	2(1.42)	2(1.91)	6:33	5.6
Level 40	2(1.17)	2(1.33)	2(1.82)	6:08	5.5
Level 45	2(1.13)	2(1.28)	2(1.76)	5:54	5.4
Level 50	2(1.11)	2(1.23)	2(1.70)	5:39	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.

2 trainers at level 40

Zacian (Crowned Sword)1.17

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)1.17
Zamazenta (Crowned Shield)1.20
Necrozma (Dusk Mane)1.24
Necrozma (Dawn Wings)1.36
Blacephalon1.46
Reshiram1.58

A mixed local group

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

2 trainers at level 40

Blaziken1.77
Volcarona1.78
Hydreigon1.79
Darmanitan (Standard)1.80
Tyranitar1.80
Rampardos1.81

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 + Mind Blown

6. Reshiram

Fire Fang + Fusion Flare

See the full ranked counter list for Froslass · 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.