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 Necrozma's top six counters needs 2.18 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.52 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 10:02. No level in this range makes it soloable with a prepared party.

Necrozma · Tier 5

psychic

Weak to

bugghostdark

Boss CP: 47,210
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 Necrozma 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	4(3.09)	4(3.58)	4(3.85)	16:29	6.0
Level 25	3(2.38)	3(2.91)	4(3.20)	13:23	6.0
Level 30	2(1.92)	3(2.51)	3(2.77)	11:34	6.0
Level 35	2(1.88)	3(2.31)	3(2.65)	10:37	6.0
Level 40	2(1.74)	3(2.18)	3(2.52)	10:02	6.0
Level 45	2(1.71)	3(2.11)	3(2.43)	9:44	6.0
Level 50	2(1.69)	3(2.04)	3(2.32)	9:24	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

Necrozma (Dawn Wings)1.74

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)1.74
Darkrai2.13
Tyranitar2.29
Hydreigon2.30
Blacephalon2.29
Lunala2.33

A mixed local group

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

3 trainers at level 40

Chandelure2.46
Gholdengo2.46
Eternatus2.50
Incineroar2.51
Dragapult2.52
Giratina (Origin)2.52

The party these numbers assume

1. Necrozma (Dawn Wings)

Shadow Claw + Moongeist Beam

2. Darkrai

Snarl + Foul Play

3. Tyranitar

Bite + Brutal Swing

4. Hydreigon

Bite + Brutal Swing

5. Blacephalon

Astonish + Shadow Ball

6. Lunala

Shadow Claw + Shadow Ball

See the full ranked counter list for Necrozma · 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.