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 Buneary's top six counters needs 1.15 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.41 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 5:16. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Buneary · Tier 5

normal

Weak to

fighting

Boss CP: 19,453
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 Buneary 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(1.35)	2(1.60)	2(1.98)	7:20	5.9
Level 25	2(1.17)	2(1.41)	2(1.72)	6:28	5.5
Level 30	2(1.06)	2(1.26)	2(1.55)	5:47	5.2
Level 35	2(1.03)	2(1.20)	2(1.47)	5:32	5.0
Level 40	1(0.97)	2(1.15)	2(1.41)	5:16	4.8
Level 45	1(0.94)	2(1.12)	2(1.36)	5:08	4.5
Level 50	1(0.93)	2(1.08)	2(1.31)	4:58	4.2

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

Keldeo0.97

A prepared party

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

2 trainers at level 40

Keldeo0.97
Lucario1.09
Terrakion1.12
Blaziken1.16
Kartana1.25
Eternatus1.30

A mixed local group

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

2 trainers at level 40

Zacian (Crowned Sword)1.36
Necrozma (Dusk Mane)1.36
Breloom1.39
Mewtwo1.38
Machamp1.42
Hisuian Decidueye1.42

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. Eternatus

Poison Jab + Dynamax Cannon

See the full ranked counter list for Buneary · 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.