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 Staraptor's top six counters needs 1.03 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.31 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 3:01. A prepared solo becomes possible at level 50. A duo works from level 20.

Staraptor · Shadow Tier 3

normalflying

Weak to

rockelectricice

Boss CP: 19,606
Boss HP: 4,000
Raid timer: 180s
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	2(1.48)	2(1.66)	3(2.02)	4:51	6.0
Level 25	2(1.18)	2(1.36)	2(1.70)	3:58	6.0
Level 30	2(1.02)	2(1.18)	2(1.46)	3:27	6.0
Level 35	1(0.97)	2(1.10)	2(1.38)	3:13	5.9
Level 40	1(0.94)	2(1.03)	2(1.31)	3:01	5.9
Level 45	1(0.89)	2(1.00)	2(1.26)	2:56	5.7
Level 50	1(0.86)	1(0.96)	2(1.20)	2:48	5.5

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

Kyurem (White)0.94

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)0.94
Regieleki0.99
Kyurem (Black)0.98
Xurkitree1.06
Thundurus (Therian)1.09
Zeraora1.11

A mixed local group

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

2 trainers at level 40

Necrozma (Dusk Mane)1.26
Raikou1.28
Electivire1.28
Zacian (Crowned Sword)1.30
Tyrantrum1.30
Gigalith1.31

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. Xurkitree

Thunder Shock + Discharge

5. Thundurus (Therian)

Volt Switch + Wildbolt Storm

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.