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 4 to be safe — 3 if everyone is prepared

At level 40, a party of Barbaracle's top six counters needs 2.52 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.09 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 11:35. No level in this range makes it soloable with a prepared party.

Barbaracle · Elite

rockwater

Weak to

grassfightinggroundelectric

Boss CP: 43,840
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 Barbaracle 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	4(3.24)	4(3.86)	5(4.63)	17:47	6.0
Level 25	3(2.86)	4(3.16)	4(3.92)	14:34	6.0
Level 30	3(2.57)	3(2.78)	4(3.47)	12:48	6.0
Level 35	3(2.41)	3(2.62)	4(3.26)	12:05	6.0
Level 40	3(2.27)	3(2.52)	4(3.09)	11:35	6.0
Level 45	3(2.17)	3(2.41)	3(2.97)	11:07	6.0
Level 50	3(2.09)	3(2.33)	3(2.87)	10:43	6.0

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.

3 trainers at level 40

Kartana2.27

A prepared party

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

3 trainers at level 40

Kartana2.27
Shaymin (Sky)2.44
Zarude2.52
Rillaboom2.58
Xurkitree2.61
Meowscarada2.69

A mixed local group

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

4 trainers at level 40

Shaymin (Land)2.92
Tangrowth2.93
Breloom2.92
Tsareena2.96
Torterra3.01
Simisage3.04

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. Meowscarada

Leafage + Frenzy Plant

See the full ranked counter list for Barbaracle · 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.