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 4 to be safe — 3 if everyone is prepared

At level 40, a party of Froslass's top six counters needs 2.31 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.09 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 10:37. No level in this range makes it soloable with a prepared party.

Froslass · Elite

iceghost

Weak to

rockghoststeelfiredark

Boss CP: 33,788
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 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	3(2.80)	4(3.46)	5(4.54)	15:55	6.0
Level 25	3(2.40)	4(3.03)	4(3.87)	13:55	6.0
Level 30	3(2.22)	3(2.66)	4(3.41)	12:16	5.9
Level 35	3(2.04)	3(2.46)	4(3.24)	11:20	5.8
Level 40	2(2.00)	3(2.31)	4(3.09)	10:37	5.8
Level 45	2(1.94)	3(2.21)	3(2.99)	10:10	5.7
Level 50	2(1.89)	3(2.16)	3(2.88)	9:56	5.6

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

Zamazenta (Crowned Shield)2.00

A prepared party

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

3 trainers at level 40

Zamazenta (Crowned Shield)2.00
Zacian (Crowned Sword)2.00
Necrozma (Dusk Mane)2.09
Necrozma (Dawn Wings)2.30
Reshiram2.63
Kyurem (White)2.81

A mixed local group

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

4 trainers at level 40

Tyranitar3.01
Volcarona3.02
Lunala3.02
Hydreigon3.06
Blaziken3.07
Dialga3.09

The party these numbers assume

1. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

2. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

3. Necrozma (Dusk Mane)

Metal Claw + Sunsteel Strike

4. Necrozma (Dawn Wings)

Shadow 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.