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 Skarmory's top six counters needs 0.76 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 0.96 (round up: 1). The raid timer is 180 seconds and one prepared trainer alone would take 2:14. A prepared solo becomes possible at level 25. A duo works from level 20.

Skarmory · Tier 3

steelflying

Weak to

fireelectric

Boss CP: 15,182
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 Skarmory 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(1.14)	2(1.11)	2(1.38)	3:15	5.8
Level 25	1(0.95)	1(0.97)	2(1.19)	2:49	5.1
Level 30	1(0.82)	1(0.84)	2(1.05)	2:28	4.3
Level 35	1(0.77)	1(0.81)	1(1.00)	2:22	3.8
Level 40	1(0.72)	1(0.76)	1(0.96)	2:14	3.4
Level 45	1(0.68)	1(0.73)	1(0.92)	2:09	3.1
Level 50	1(0.67)	1(0.71)	1(0.89)	2:05	2.9

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

Blacephalon0.72

A prepared party

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

1 trainer at level 40

Blacephalon0.72
Regieleki0.74
Thundurus (Therian)0.76
Reshiram0.76
Zeraora0.79
Xurkitree0.81

A mixed local group

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

1 trainer at level 40

Raikou0.92
Chandelure0.94
Moltres0.95
Delphox0.94
Darmanitan (Standard)0.96
Entei0.96

The party these numbers assume

1. Blacephalon

Incinerate + Mind Blown

2. Regieleki

Thunder Shock + Thunder Cage

3. Thundurus (Therian)

Volt Switch + Wildbolt Storm

4. Reshiram

Fire Fang + Fusion Flare

5. Zeraora

Volt Switch + Plasma Fists

6. Xurkitree

Thunder Shock + Discharge

See the full ranked counter list for Skarmory · 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.