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 — 2 if everyone is prepared

At level 40, a party of Vigoroth's top six counters needs 1.08 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.31 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 3:10. A prepared solo becomes possible at level 50. A duo works from level 20.

Vigoroth · Shadow Tier 3

normal

Weak to

fighting

Boss CP: 13,920
Boss HP: 4,000
Raid timer: 180s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Vigoroth 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(1.28)	2(1.55)	2(1.86)	4:33	5.9
Level 25	2(1.07)	2(1.32)	2(1.62)	3:51	5.6
Level 30	2(1.01)	2(1.18)	2(1.43)	3:27	5.2
Level 35	1(0.97)	2(1.13)	2(1.37)	3:18	5.0
Level 40	1(0.92)	2(1.08)	2(1.31)	3:10	4.8
Level 45	1(0.85)	2(1.03)	2(1.27)	3:01	4.6
Level 50	1(0.83)	1(1.00)	2(1.23)	2:55	4.3

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

Keldeo0.92

A prepared party

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

2 trainers at level 40

Keldeo0.92
Lucario1.05
Terrakion1.06
Kartana1.13
Blaziken1.15
Conkeldurr1.19

A mixed local group

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

2 trainers at level 40

Zacian (Crowned Sword)1.27
Breloom1.27
Marshadow1.29
Zamazenta (Crowned Shield)1.28
Raikou1.30
Mewtwo1.29

The party these numbers assume

1. Keldeo

Low Kick + Secret Sword

2. Lucario

Force Palm + Aura Sphere

3. Terrakion

Double Kick + Sacred Sword

4. Kartana

Fury Cutter + Sacred Sword

5. Blaziken

Counter + Aura Sphere

6. Conkeldurr

Force Palm + Dynamic Punch

See the full ranked counter list for Vigoroth · 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.