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 Vikavolt's top six counters needs 1.28 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.46 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 3:44. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Vikavolt · Shadow Tier 3

bugelectric

Weak to

rockfire

Boss CP: 22,377
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 Vikavolt 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(1.69)	2(2.00)	3(2.33)	5:51	5.9
Level 25	2(1.41)	2(1.65)	2(1.87)	4:50	5.8
Level 30	2(1.28)	2(1.42)	2(1.63)	4:10	5.6
Level 35	2(1.21)	2(1.35)	2(1.56)	3:56	5.3
Level 40	2(1.16)	2(1.28)	2(1.46)	3:44	5.2
Level 45	2(1.13)	2(1.24)	2(1.40)	3:37	5.1
Level 50	2(1.05)	2(1.18)	2(1.34)	3:27	4.8

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.

2 trainers at level 40

Reshiram1.16

A prepared party

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

2 trainers at level 40

Reshiram1.16
Blacephalon1.15
Heatran1.30
Eternatus1.35
Rampardos1.34
Glimmora1.35

A mixed local group

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

2 trainers at level 40

Necrozma (Dawn Wings)1.42
Gigalith1.47
Darmanitan (Standard)1.44
Tyrantrum1.46
Kyurem (Black)1.45
Charizard1.48

The party these numbers assume

1. Reshiram

Fire Fang + Fusion Flare

2. Blacephalon

Incinerate + Mind Blown

3. Heatran

Fire Spin + Magma Storm

4. Eternatus

Dragon Tail + Dynamax Cannon

5. Rampardos

Smack Down + Rock Slide

6. Glimmora

Rock Throw + Meteor Beam

See the full ranked counter list for Vikavolt · 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.