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 Frosmoth's top six counters needs 1.09 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.26 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 5:01. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Frosmoth · Tier 5

icebug

Weak to

rockfireflyingsteel

Boss CP: 39,123
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 Frosmoth 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(1.50)	2(1.63)	2(1.83)	7:31	6.0
Level 25	2(1.17)	2(1.39)	2(1.59)	6:24	6.0
Level 30	2(1.01)	2(1.23)	2(1.39)	5:39	5.9
Level 35	1(0.95)	2(1.16)	2(1.32)	5:19	5.8
Level 40	1(0.89)	2(1.09)	2(1.26)	5:01	5.8
Level 45	1(0.85)	2(1.05)	2(1.21)	4:50	5.8
Level 50	1(0.84)	2(1.02)	2(1.17)	4:40	5.7

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

Blacephalon0.89

A prepared party

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

2 trainers at level 40

Blacephalon0.89
Reshiram1.01
Heatran1.13
Cinderace1.15
Glimmora1.18
Blaziken1.19

A mixed local group

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

2 trainers at level 40

Moltres1.21
Delphox1.22
Emboar1.24
Volcanion1.25
Zamazenta (Crowned Shield)1.25
Entei1.25

The party these numbers assume

1. Blacephalon

Incinerate + Mind Blown

2. Reshiram

Fire Fang + Fusion Flare

3. Heatran

Fire Spin + Magma Storm

4. Cinderace

Fire Spin + Pyroball

5. Glimmora

Rock Throw + Meteor Beam

6. Blaziken

Fire Spin + Blast Burn

See the full ranked counter list for Frosmoth · 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.