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 Jangmo-o's top six counters needs 1.70 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.21 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 7:51. No level in this range makes it soloable with a prepared party. A duo works from level 30.

Jangmo-o · Elite

dragon

Weak to

icedragonfairy

Boss CP: 18,350
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 Jangmo-o 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(2.06)	3(2.44)	4(3.08)	11:13	5.9
Level 25	2(1.73)	3(2.09)	3(2.68)	9:37	5.7
Level 30	2(1.57)	2(1.86)	3(2.38)	8:34	5.6
Level 35	2(1.48)	2(1.78)	3(2.30)	8:11	5.5
Level 40	2(1.44)	2(1.70)	3(2.21)	7:51	5.5
Level 45	2(1.38)	2(1.64)	3(2.12)	7:33	5.4
Level 50	2(1.34)	2(1.60)	3(2.05)	7:20	5.4

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

Eternatus1.44

A prepared party

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

2 trainers at level 40

Eternatus1.44
Kyurem (Black)1.53
Kyurem (White)1.69
Baxcalibur1.84
Palkia (Origin)1.83
Rayquaza1.90

A mixed local group

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

3 trainers at level 40

Palkia2.07
Salamence2.08
Enamorus (Incarnate)2.17
Dragonite2.16
Kyurem2.17
Zamazenta (Crowned Shield)2.22

The party these numbers assume

1. Eternatus

Dragon Tail + Dynamax Cannon

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Kyurem (White)

Dragon Breath + Ice Burn

4. Baxcalibur

Ice Fang + Glaive Rush

5. Palkia (Origin)

Dragon Tail + Spacial Rend

6. Rayquaza

Dragon Tail + Breaking Swipe

See the full ranked counter list for Jangmo-o · 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.