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 2 to be safe — 2 if everyone is prepared

At level 40, a party of Starly's top six counters needs 1.10 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.41 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 5:04. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Starly · Elite

normalflying

Weak to

rockelectricice

Boss CP: 14,016
Boss HP: 20,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Starly 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(1.45)	2(1.59)	2(1.98)	7:19	6.0
Level 25	2(1.23)	2(1.36)	2(1.72)	6:16	5.9
Level 30	2(1.12)	2(1.22)	2(1.55)	5:37	5.9
Level 35	2(1.05)	2(1.15)	2(1.48)	5:17	5.7
Level 40	2(1.01)	2(1.10)	2(1.41)	5:04	5.5
Level 45	1(0.98)	2(1.06)	2(1.36)	4:53	5.4
Level 50	1(0.95)	2(1.02)	2(1.31)	4:43	5.2

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

Kyurem (White)1.01

A prepared party

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

2 trainers at level 40

Kyurem (White)1.01
Regieleki1.06
Kyurem (Black)1.09
Thundurus (Therian)1.12
Zeraora1.15
Xurkitree1.17

A mixed local group

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

2 trainers at level 40

Zacian (Crowned Sword)1.37
Galarian Darmanitan (Standard)1.37
Necrozma (Dusk Mane)1.38
Raikou1.38
Rhyperior1.39
Tyrantrum1.40

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Regieleki

Lock-On + Thunder Cage

3. Kyurem (Black)

Dragon Tail + Freeze Shock

4. Thundurus (Therian)

Volt Switch + Wildbolt Storm

5. Zeraora

Volt Switch + Plasma Fists

6. Xurkitree

Thunder Shock + Discharge

See the full ranked counter list for Starly · 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.