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 Staraptor's top six counters needs 2.73 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.36 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 12:53. No level in this range makes it soloable with a prepared party.

Staraptor · Shadow Tier 5

normalflying

Weak to

rockelectricice

Boss CP: 37,967
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 Staraptor 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(3.94)	5(4.61)	6(5.28)	21:47	6.0
Level 25	4(3.13)	4(3.60)	5(4.45)	17:00	6.0
Level 30	3(2.64)	4(3.05)	4(3.74)	14:24	6.0
Level 35	3(2.48)	3(2.86)	4(3.54)	13:29	6.0
Level 40	3(2.35)	3(2.73)	4(3.36)	12:53	6.0
Level 45	3(2.32)	3(2.60)	4(3.23)	12:17	6.0
Level 50	3(2.22)	3(2.50)	4(3.15)	11:48	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.

3 trainers at level 40

Kyurem (White)2.35

A prepared party

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

3 trainers at level 40

Kyurem (White)2.35
Kyurem (Black)2.67
Regieleki2.87
Thundurus (Therian)2.81
Xurkitree2.83
Zeraora2.84

A mixed local group

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

4 trainers at level 40

Rhyperior3.24
Zacian (Crowned Sword)3.25
Necrozma (Dusk Mane)3.29
Zapdos3.28
Rampardos3.30
Terrakion3.37

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Regieleki

Thunder Shock + Thunder Cage

4. Thundurus (Therian)

Volt Switch + Wildbolt Storm

5. Xurkitree

Thunder Shock + Discharge

6. Zeraora

Volt Switch + Plasma Fists

See the full ranked counter list for Staraptor · 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.