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 Brambleghast's top six counters needs 1.41 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.73 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 6:30. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Brambleghast · Tier 5

grassghost

Weak to

flyingghostfireicedark

Boss CP: 37,527
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 Brambleghast 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(1.88)	3(2.24)	3(2.50)	10:17	6.0
Level 25	2(1.64)	2(1.84)	3(2.15)	8:27	6.0
Level 30	2(1.46)	2(1.54)	2(1.91)	7:06	6.0
Level 35	2(1.38)	2(1.47)	2(1.81)	6:46	6.0
Level 40	2(1.32)	2(1.41)	2(1.73)	6:30	6.0
Level 45	2(1.27)	2(1.35)	2(1.67)	6:12	5.9
Level 50	2(1.23)	2(1.30)	2(1.61)	5:58	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.

2 trainers at level 40

Kyurem (White)1.32

A prepared party

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

2 trainers at level 40

Kyurem (White)1.32
Kyurem (Black)1.36
Rayquaza1.37
Necrozma (Dawn Wings)1.41
Blacephalon1.50
Reshiram1.52

A mixed local group

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

2 trainers at level 40

Honchkrow1.69
Staraptor1.70
Galarian Articuno1.71
Zamazenta (Crowned Shield)1.71
Heatran1.72
Chandelure1.75

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Shadow Claw + Freeze Shock

3. Rayquaza

Air Slash + Dragon Ascent

4. Necrozma (Dawn Wings)

Psycho Cut + Moongeist Beam

5. Blacephalon

Astonish + Mind Blown

6. Reshiram

Fire Fang + Fusion Flare

See the full ranked counter list for Brambleghast · 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.