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 3 to be safe — 2 if everyone is prepared

At level 40, a party of Chimchar's top six counters needs 1.84 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.12 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 8:40. No level in this range makes it soloable with a prepared party. A duo works from level 35.

Chimchar · Shadow Tier 5

fire

Weak to

groundrockwater

Boss CP: 15,754
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 Chimchar 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	3(2.54)	3(2.59)	3(2.97)	12:15	5.9
Level 25	3(2.11)	3(2.23)	3(2.57)	10:32	5.6
Level 30	2(1.92)	3(2.03)	3(2.30)	9:36	5.3
Level 35	2(1.76)	2(1.92)	3(2.22)	9:03	5.1
Level 40	2(1.71)	2(1.84)	3(2.12)	8:40	4.9
Level 45	2(1.68)	2(1.79)	3(2.06)	8:27	4.8
Level 50	2(1.60)	2(1.72)	2(1.97)	8:09	4.7

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

Landorus (Therian)1.71

A prepared party

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

2 trainers at level 40

Landorus (Therian)1.71
Inteleon1.78
Kyogre1.84
Rampardos1.87
Glimmora1.90
Eternatus1.92

A mixed local group

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

3 trainers at level 40

Tyrantrum2.02
Primarina2.04
Necrozma (Dawn Wings)2.06
Garchomp2.09
Excadrill2.14
Terrakion2.11

The party these numbers assume

1. Landorus (Therian)

Mud Shot + Sandsear Storm

2. Inteleon

Water Gun + Hydro Cannon

3. Kyogre

Waterfall + Origin Pulse

4. Rampardos

Smack Down + Rock Slide

5. Glimmora

Rock Throw + Meteor Beam

6. Eternatus

Poison Jab + Dynamax Cannon

See the full ranked counter list for Chimchar · 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.