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 3 to be safe — 3 if everyone is prepared

At level 40, a party of Barraskewda's top six counters needs 2.43 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.93 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 11:10. No level in this range makes it soloable with a prepared party.

Barraskewda · Elite

water

Weak to

grasselectric

Boss CP: 46,006
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 Barraskewda 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(3.66)	4(3.73)	5(4.44)	17:11	6.0
Level 25	4(3.11)	4(3.11)	4(3.81)	14:18	6.0
Level 30	3(2.70)	3(2.73)	4(3.29)	12:32	6.0
Level 35	3(2.48)	3(2.54)	4(3.10)	11:42	6.0
Level 40	3(2.39)	3(2.43)	3(2.93)	11:10	6.0
Level 45	3(2.32)	3(2.33)	3(2.84)	10:44	6.0
Level 50	3(2.23)	3(2.23)	3(2.73)	10:15	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

Xurkitree2.39

A prepared party

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

3 trainers at level 40

Xurkitree2.39
Zeraora2.37
Thundurus (Therian)2.41
Zekrom2.45
Regieleki2.45
Shaymin (Sky)2.48

A mixed local group

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

3 trainers at level 40

Kyurem (Black)2.76
Tapu Bulu2.82
Roserade2.82
Chesnaught2.86
Zapdos2.88
Sceptile2.96

The party these numbers assume

1. Xurkitree

Thunder Shock + Discharge

2. Zeraora

Volt Switch + Plasma Fists

3. Thundurus (Therian)

Volt Switch + Wildbolt Storm

4. Zekrom

Charge Beam + Fusion Bolt

5. Regieleki

Thunder Shock + Thunder Cage

6. Shaymin (Sky)

Magical Leaf + Grass Knot

See the full ranked counter list for Barraskewda · 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.