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 1 to be safe — 1 if everyone is prepared

At level 40, a party of Cherubi's top six counters needs 0.33 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 0.39 (round up: 1). The raid timer is 180 seconds and one prepared trainer alone would take 0:58. A prepared solo becomes possible at level 20. A duo works from level 20.

Cherubi · Tier 3

grass

Weak to

flyingpoisonbugfireice

Boss CP: 7,633
Boss HP: 3,600
Raid timer: 180s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Cherubi 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	1(0.43)	1(0.45)	1(0.54)	1:18	1.4
Level 25	1(0.39)	1(0.40)	1(0.48)	1:10	1.0
Level 30	1(0.34)	1(0.36)	1(0.43)	1:03	0.6
Level 35	1(0.34)	1(0.35)	1(0.42)	1:01	0.5
Level 40	1(0.30)	1(0.33)	1(0.39)	0:58	0.4
Level 45	1(0.29)	1(0.32)	1(0.38)	0:56	0.3
Level 50	1(0.29)	1(0.31)	1(0.37)	0:54	0.3

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

Blacephalon0.30

A prepared party

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

1 trainer at level 40

Blacephalon0.30
Kyurem (White)0.31
Rayquaza0.32
Eternatus0.34
Kyurem (Black)0.35
Salamence0.36

A mixed local group

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

1 trainer at level 40

Chandelure0.38
Blaziken0.39
Enamorus (Incarnate)0.39
Naganadel0.39
Necrozma (Dusk Mane)0.39
Volcarona0.39

The party these numbers assume

1. Blacephalon

Astonish + Mind Blown

2. Kyurem (White)

Ice Fang + Ice Burn

3. Rayquaza

Air Slash + Dragon Ascent

4. Eternatus

Poison Jab + Dynamax Cannon

5. Kyurem (Black)

Dragon Tail + Freeze Shock

6. Salamence

Fire Fang + Fly

See the full ranked counter list for Cherubi · 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.