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 — 3 if everyone is prepared

At level 40, a party of Darkrai's top six counters needs 2.13 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.62 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 9:48. No level in this range makes it soloable with a prepared party. A duo works from level 50.

Darkrai · Tier 5

dark

Weak to

fightingbugfairy

Boss CP: 53,623
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 Darkrai 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(2.79)	4(3.34)	4(3.95)	15:22	6.0
Level 25	3(2.18)	3(2.71)	4(3.37)	12:29	6.0
Level 30	2(1.97)	3(2.43)	3(2.92)	11:10	6.0
Level 35	2(1.90)	3(2.27)	3(2.77)	10:26	6.0
Level 40	2(1.75)	3(2.13)	3(2.62)	9:48	6.0
Level 45	2(1.71)	3(2.05)	3(2.52)	9:27	6.0
Level 50	2(1.67)	2(1.99)	3(2.42)	9:08	6.0

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

Keldeo1.75

A prepared party

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

3 trainers at level 40

Keldeo1.75
Terrakion2.04
Blaziken2.20
Lucario2.24
Zacian (Crowned Sword)2.26
Kartana2.28

A mixed local group

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

3 trainers at level 40

Gallade2.51
Tapu Bulu2.52
Tapu Koko2.53
Volcarona2.59
Togekiss2.61
Marshadow2.60

The party these numbers assume

1. Keldeo

Low Kick + Secret Sword

2. Terrakion

Double Kick + Sacred Sword

3. Blaziken

Counter + Aura Sphere

4. Lucario

Force Palm + Aura Sphere

5. Zacian (Crowned Sword)

Metal Claw + Play Rough

6. Kartana

Fury Cutter + Sacred Sword

See the full ranked counter list for Darkrai · 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.