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 Eevee's top six counters needs 1.23 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.51 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 5:40. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Eevee · Tier 5

normal

Weak to

fighting

Boss CP: 16,553
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 Eevee 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(1.46)	2(1.73)	3(2.07)	7:58	5.9
Level 25	2(1.30)	2(1.52)	2(1.84)	7:01	5.9
Level 30	2(1.16)	2(1.35)	2(1.65)	6:13	5.7
Level 35	2(1.11)	2(1.29)	2(1.57)	5:56	5.5
Level 40	2(1.04)	2(1.23)	2(1.51)	5:40	5.3
Level 45	2(1.02)	2(1.18)	2(1.46)	5:26	5.2
Level 50	1(0.99)	2(1.15)	2(1.41)	5:17	5.1

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

Keldeo1.04

A prepared party

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

2 trainers at level 40

Keldeo1.04
Lucario1.18
Terrakion1.23
Blaziken1.28
Kartana1.31
Pheromosa1.34

A mixed local group

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

2 trainers at level 40

Gallade1.46
Zacian (Crowned Sword)1.46
Necrozma (Dusk Mane)1.48
Mewtwo1.50
Zamazenta (Crowned Shield)1.50
Machamp1.50

The party these numbers assume

1. Keldeo

Low Kick + Secret Sword

2. Lucario

Force Palm + Aura Sphere

3. Terrakion

Double Kick + Sacred Sword

4. Blaziken

Counter + Aura Sphere

5. Kartana

Fury Cutter + Sacred Sword

6. Pheromosa

Low Kick + Focus Blast

See the full ranked counter list for Eevee · 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.