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 Dartrix's top six counters needs 1.08 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.42 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 4:58. A prepared solo becomes possible at level 50. A duo works from level 20.

Dartrix · Tier 5

grassflying

Weak to

iceflyingpoisonrockfire

Boss CP: 23,861
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 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(1.11)	2(1.54)	3(2.02)	7:04	6.0
Level 25	1(0.95)	2(1.32)	2(1.75)	6:05	5.8
Level 30	1(0.86)	2(1.18)	2(1.57)	5:27	5.5
Level 35	1(0.82)	2(1.13)	2(1.48)	5:11	5.3
Level 40	1(0.80)	2(1.08)	2(1.42)	4:58	5.2
Level 45	1(0.77)	2(1.03)	2(1.37)	4:45	5.0
Level 50	1(0.74)	1(1.00)	2(1.33)	4:36	4.9

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.

1 trainer at level 40

Kyurem (White)0.80

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)0.80
Kyurem (Black)1.06
Baxcalibur1.10
Galarian Darmanitan (Standard)1.10
Mamoswine1.17
Weavile1.24

A mixed local group

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

2 trainers at level 40

Eternatus1.35
Mewtwo1.38
Mr. Rime1.37
Kyurem1.39
Aurorus1.41
Reshiram1.40

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Baxcalibur

Ice Fang + Avalanche

4. Galarian Darmanitan (Standard)

Ice Fang + Avalanche

5. Mamoswine

Powder Snow + Avalanche

6. Weavile

Ice Shard + Triple Axel

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.