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 6 to be safe — 5 if everyone is prepared

At level 40, a party of Wishiwashi (School)'s top six counters needs 4.34 trainers (round up: 5), and a mixed lobby of ranks 13-24 needs 5.13 (round up: 6). The raid timer is 300 seconds and one prepared trainer alone would take 19:58. No level in this range makes it soloable with a prepared party.

Wishiwashi (School) · Elite

water

Weak to

grasselectric

Boss CP: 61,213
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 Wishiwashi (School) 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	7(6.37)	7(6.50)	8(7.60)	29:56	6.0
Level 25	6(5.25)	6(5.50)	7(6.54)	25:19	6.0
Level 30	5(4.57)	5(4.89)	6(5.74)	22:29	6.0
Level 35	5(4.44)	5(4.65)	6(5.43)	21:25	6.0
Level 40	5(4.22)	5(4.34)	6(5.13)	19:58	6.0
Level 45	5(4.07)	5(4.20)	5(4.93)	19:19	6.0
Level 50	4(3.84)	5(4.04)	5(4.78)	18:36	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.

5 trainers at level 40

Kartana4.22

A prepared party

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

5 trainers at level 40

Kartana4.22
Zekrom4.23
Zeraora4.26
Xurkitree4.38
Shaymin (Sky)4.41
Eternatus4.54

A mixed local group

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

6 trainers at level 40

Meowscarada4.85
Electivire4.95
Roserade5.04
Necrozma (Dawn Wings)5.09
Zapdos5.07
Decidueye5.11

The party these numbers assume

1. Kartana

Razor Leaf + Leaf Blade

2. Zekrom

Charge Beam + Fusion Bolt

3. Zeraora

Spark + Plasma Fists

4. Xurkitree

Thunder Shock + Discharge

5. Shaymin (Sky)

Magical Leaf + Grass Knot

6. Eternatus

Poison Jab + Dynamax Cannon

See the full ranked counter list for Wishiwashi (School) · 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.