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 Charjabug's top six counters needs 1.23 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.41 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 3:35. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Charjabug · Shadow Tier 3

bugelectric

Weak to

rockfire

Boss CP: 13,424
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 Charjabug 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(1.58)	2(1.77)	3(2.01)	5:10	5.3
Level 25	2(1.40)	2(1.53)	2(1.74)	4:28	4.8
Level 30	2(1.13)	2(1.34)	2(1.54)	3:55	4.4
Level 35	2(1.09)	2(1.29)	2(1.48)	3:47	4.3
Level 40	2(1.02)	2(1.23)	2(1.41)	3:35	4.0
Level 45	1(0.98)	2(1.19)	2(1.35)	3:30	3.9
Level 50	1(0.95)	2(1.16)	2(1.31)	3:24	3.8

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

Blacephalon1.02

A prepared party

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

2 trainers at level 40

Blacephalon1.02
Reshiram1.12
Heatran1.29
Rampardos1.30
Cinderace1.30
Chandelure1.33

A mixed local group

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

2 trainers at level 40

Glimmora1.37
Moltres1.40
Tyrantrum1.38
Rhyperior1.39
Delphox1.39
Charizard1.41

The party these numbers assume

1. Blacephalon

Incinerate + Mind Blown

2. Reshiram

Fire Fang + Fusion Flare

3. Heatran

Fire Spin + Magma Storm

4. Rampardos

Smack Down + Rock Slide

5. Cinderace

Fire Spin + Pyroball

6. Chandelure

Fire Spin + Overheat

See the full ranked counter list for Charjabug · 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.