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 Dartrix's top six counters needs 1.81 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.40 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 8:21. No level in this range makes it soloable with a prepared party. A duo works from level 35.

Dartrix · Elite

grassflying

Weak to

iceflyingpoisonrockfire

Boss CP: 27,553
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 Dartrix 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(1.86)	3(2.67)	4(3.43)	12:18	6.0
Level 25	2(1.64)	3(2.26)	3(2.96)	10:23	6.0
Level 30	2(1.46)	3(2.01)	3(2.65)	9:14	5.9
Level 35	2(1.38)	2(1.90)	3(2.51)	8:44	5.9
Level 40	2(1.32)	2(1.81)	3(2.40)	8:21	5.8
Level 45	2(1.28)	2(1.76)	3(2.31)	8:06	5.7
Level 50	2(1.24)	2(1.68)	3(2.22)	7:43	5.6

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

Kyurem (White)1.32

A prepared party

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

2 trainers at level 40

Kyurem (White)1.32
Kyurem (Black)1.69
Galarian Darmanitan (Standard)1.86
Baxcalibur1.88
Mamoswine2.05
Glaceon2.09

A mixed local group

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

3 trainers at level 40

Jynx2.28
Mewtwo2.34
Aurorus2.35
Mr. Rime2.34
Kyurem2.36
Reshiram2.39

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Galarian Darmanitan (Standard)

Ice Fang + Avalanche

4. Baxcalibur

Ice Fang + Avalanche

5. Mamoswine

Powder Snow + Avalanche

6. Glaceon

Frost Breath + Avalanche

See the full ranked counter list for Dartrix · 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.