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 5 to be safe — 4 if everyone is prepared

At level 40, a party of Bronzong's top six counters needs 3.66 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.34 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 16:51. No level in this range makes it soloable with a prepared party.

Bronzong · Elite

steelpsychic

Weak to

groundghostfiredark

Boss CP: 37,583
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 Bronzong 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	5(4.93)	6(5.57)	7(6.45)	25:37	6.0
Level 25	5(4.09)	5(4.64)	6(5.42)	21:20	6.0
Level 30	4(3.48)	5(4.08)	5(4.83)	18:46	6.0
Level 35	4(3.36)	4(3.88)	5(4.55)	17:51	6.0
Level 40	4(3.27)	4(3.66)	5(4.34)	16:51	5.9
Level 45	3(2.97)	4(3.49)	5(4.18)	16:03	5.9
Level 50	3(2.88)	4(3.39)	5(4.03)	15:37	5.9

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.

4 trainers at level 40

Necrozma (Dawn Wings)3.27

A prepared party

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

4 trainers at level 40

Necrozma (Dawn Wings)3.27
Blacephalon3.57
Reshiram3.64
Landorus (Therian)3.63
Darkrai3.81
Lunala4.05

A mixed local group

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

5 trainers at level 40

Groudon4.18
Ho-Oh4.25
Absol4.30
Dragapult4.31
Gholdengo4.34
Incineroar4.36

The party these numbers assume

1. Necrozma (Dawn Wings)

Shadow Claw + Moongeist Beam

2. Blacephalon

Astonish + Mind Blown

3. Reshiram

Fire Fang + Fusion Flare

4. Landorus (Therian)

Mud Shot + Sandsear Storm

5. Darkrai

Snarl + Foul Play

6. Lunala

Shadow Claw + Shadow Ball

See the full ranked counter list for Bronzong · 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.