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 — 1 if everyone is prepared

At level 40, a party of Froslass's top six counters needs 0.93 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 1.28 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 2:44. A prepared solo becomes possible at level 40. A duo works from level 20.

Froslass · Shadow Tier 3

iceghost

Weak to

rockghoststeelfiredark

Boss CP: 15,110
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 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(1.18)	2(1.42)	2(1.85)	4:10	5.7
Level 25	1(0.98)	2(1.20)	2(1.61)	3:30	5.3
Level 30	1(0.88)	2(1.05)	2(1.42)	3:05	4.5
Level 35	1(0.87)	2(1.01)	2(1.33)	2:57	4.4
Level 40	1(0.78)	1(0.93)	2(1.28)	2:44	4.2
Level 45	1(0.79)	1(0.92)	2(1.24)	2:42	3.9
Level 50	1(0.78)	1(0.89)	2(1.20)	2:37	3.7

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.

1 trainer at level 40

Zacian (Crowned Sword)0.78

A prepared party

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

1 trainer at level 40

Zacian (Crowned Sword)0.78
Zamazenta (Crowned Shield)0.84
Necrozma (Dusk Mane)0.86
Necrozma (Dawn Wings)0.93
Reshiram1.07
Kyurem (White)1.12

A mixed local group

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

2 trainers at level 40

Volcarona1.25
Dialga1.26
Tyranitar1.26
Blaziken1.27
Lunala1.28
Eternatus1.29

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. Reshiram

Fire Fang + Fusion Flare

6. Kyurem (White)

Steel Wing + 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.