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 Bramblin's top six counters needs 1.14 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 5:14. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Bramblin · Elite

grassghost

Weak to

flyingghostfireicedark

Boss CP: 17,094
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 Bramblin 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(1.52)	2(1.63)	2(1.99)	7:30	6.0
Level 25	2(1.32)	2(1.40)	2(1.73)	6:28	5.9
Level 30	2(1.18)	2(1.25)	2(1.55)	5:46	5.8
Level 35	2(1.14)	2(1.20)	2(1.47)	5:31	5.6
Level 40	2(1.08)	2(1.14)	2(1.41)	5:14	5.5
Level 45	2(1.05)	2(1.09)	2(1.36)	5:01	5.4
Level 50	2(1.00)	2(1.04)	2(1.32)	4:48	5.0

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)1.08

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)1.08
Necrozma (Dawn Wings)1.10
Kyurem (Black)1.12
Rayquaza1.13
Blacephalon1.15
Reshiram1.24

A mixed local group

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

2 trainers at level 40

Cinderace1.37
Staraptor1.37
Chandelure1.39
Honchkrow1.38
Volcarona1.39
Heatran1.40

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Necrozma (Dawn Wings)

Psycho Cut + Moongeist Beam

3. Kyurem (Black)

Shadow Claw + Freeze Shock

4. Rayquaza

Air Slash + Dragon Ascent

5. Blacephalon

Astonish + Mind Blown

6. Reshiram

Fire Fang + Fusion Flare

See the full ranked counter list for Bramblin · 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.