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 Binacle's top six counters needs 1.49 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.82 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 6:51. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Binacle · Elite

rockwater

Weak to

grassfightinggroundelectric

Boss CP: 18,239
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 Binacle 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(2.08)	3(2.53)	9:35	5.8
Level 25	2(1.65)	2(1.82)	3(2.20)	8:23	5.7
Level 30	2(1.46)	2(1.62)	2(1.97)	7:27	5.4
Level 35	2(1.40)	2(1.55)	2(1.89)	7:09	5.3
Level 40	2(1.34)	2(1.49)	2(1.82)	6:51	5.2
Level 45	2(1.29)	2(1.43)	2(1.74)	6:36	5.1
Level 50	2(1.25)	2(1.39)	2(1.70)	6:24	4.9

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

Kartana1.34

A prepared party

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

2 trainers at level 40

Kartana1.34
Shaymin (Sky)1.43
Zarude1.51
Rillaboom1.53
Xurkitree1.53
Roserade1.57

A mixed local group

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

2 trainers at level 40

Chesnaught1.72
Venusaur1.74
Tangrowth1.75
Shaymin (Land)1.76
Simisage1.81
Torterra1.82

The party these numbers assume

1. Kartana

Razor Leaf + Leaf Blade

2. Shaymin (Sky)

Magical Leaf + Grass Knot

3. Zarude

Vine Whip + Power Whip

4. Rillaboom

Razor Leaf + Frenzy Plant

5. Xurkitree

Thunder Shock + Power Whip

6. Roserade

Magical Leaf + Grass Knot

See the full ranked counter list for Binacle · 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.