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 — 1 if everyone is prepared

At level 40, a party of Wishiwashi (Solo)'s top six counters needs 0.88 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 1.11 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 4:04. A prepared solo becomes possible at level 30. A duo works from level 20.

Wishiwashi (Solo) · Elite

water

Weak to

grasselectric

Boss CP: 6,569
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 (Solo) 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(1.16)	2(1.22)	2(1.52)	5:37	5.5
Level 25	1(0.98)	2(1.07)	2(1.33)	4:54	5.0
Level 30	1(0.88)	1(0.96)	2(1.20)	4:26	4.0
Level 35	1(0.84)	1(0.92)	2(1.15)	4:14	3.5
Level 40	1(0.80)	1(0.88)	2(1.11)	4:04	3.1
Level 45	1(0.77)	1(0.85)	2(1.07)	3:56	2.8
Level 50	1(0.77)	1(0.83)	2(1.03)	3:49	2.5

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.

1 trainer at level 40

Regieleki0.80

A prepared party

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

1 trainer at level 40

Regieleki0.80
Thundurus (Therian)0.88
Kartana0.89
Zeraora0.90
Xurkitree0.91
Zekrom0.93

A mixed local group

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

2 trainers at level 40

Raikou1.08
Meowscarada1.09
Kyurem (Black)1.09
Necrozma (Dawn Wings)1.10
Breloom1.09
Deoxys1.11

The party these numbers assume

1. Regieleki

Lock-On + Thunder Cage

2. Thundurus (Therian)

Volt Switch + Wildbolt Storm

3. Kartana

Razor Leaf + Leaf Blade

4. Zeraora

Volt Switch + Plasma Fists

5. Xurkitree

Thunder Shock + Discharge

6. Zekrom

Charge Beam + Fusion Bolt

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