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 Wishiwashi (School)'s top six counters needs 2.55 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.08 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 11:43. No level in this range makes it soloable with a prepared party.

Wishiwashi (School) · Tier 5

water

Weak to

grasselectric

Boss CP: 53,012
Boss HP: 15,000
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	4(3.59)	4(3.89)	5(4.51)	17:53	6.0
Level 25	4(3.10)	4(3.31)	4(3.80)	15:13	6.0
Level 30	3(2.73)	3(2.87)	4(3.40)	13:11	6.0
Level 35	3(2.64)	3(2.73)	4(3.27)	12:34	6.0
Level 40	3(2.46)	3(2.55)	4(3.08)	11:43	6.0
Level 45	3(2.40)	3(2.44)	3(2.97)	11:13	6.0
Level 50	3(2.30)	3(2.34)	3(2.84)	10:47	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

Kartana2.46

A prepared party

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

3 trainers at level 40

Kartana2.46
Xurkitree2.54
Regieleki2.52
Zekrom2.57
Thundurus (Therian)2.59
Zeraora2.60

A mixed local group

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

4 trainers at level 40

Raikou2.96
Roserade2.98
Zapdos2.98
Electivire3.04
Decidueye3.05
Necrozma (Dawn Wings)3.11

The party these numbers assume

1. Kartana

Razor Leaf + Leaf Blade

2. Xurkitree

Thunder Shock + Discharge

3. Regieleki

Lock-On + Thunder Cage

4. Zekrom

Charge Beam + Fusion Bolt

5. Thundurus (Therian)

Volt Switch + Wildbolt Storm

6. Zeraora

Volt Switch + Plasma Fists

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.