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 4 to be safe — 3 if everyone is prepared

At level 40, a party of Drowzee's top six counters needs 2.62 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.01 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 12:23. No level in this range makes it soloable with a prepared party.

Drowzee · Shadow Tier 5

psychic

Weak to

bugghostdark

Boss CP: 15,651
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 Drowzee 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(2.90)	4(3.71)	5(4.18)	17:31	5.4
Level 25	3(2.44)	4(3.22)	4(3.67)	15:14	4.9
Level 30	3(2.31)	3(2.92)	4(3.23)	13:48	4.5
Level 35	3(2.23)	3(2.81)	4(3.12)	13:16	4.3
Level 40	3(2.05)	3(2.62)	4(3.01)	12:23	4.2
Level 45	2(2.00)	3(2.56)	3(2.91)	12:05	4.0
Level 50	2(1.94)	3(2.48)	3(2.79)	11:42	3.8

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.

3 trainers at level 40

Necrozma (Dawn Wings)2.05

A prepared party

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

3 trainers at level 40

Necrozma (Dawn Wings)2.05
Darkrai2.61
Blacephalon2.62
Absol2.80
Necrozma (Dusk Mane)2.83
Chandelure2.83

A mixed local group

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

4 trainers at level 40

Tyranitar2.92
Gholdengo2.94
Dragapult2.95
Hoopa (Unbound)2.97
Zoroark2.98
Hoopa2.99

The party these numbers assume

1. Necrozma (Dawn Wings)

Shadow Claw + Moongeist Beam

2. Darkrai

Snarl + Foul Play

3. Blacephalon

Astonish + Shadow Ball

4. Absol

Snarl + Brutal Swing

5. Necrozma (Dusk Mane)

Shadow Claw + Sunsteel Strike

6. Chandelure

Hex + Shadow Ball

See the full ranked counter list for Drowzee · 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.