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 6 to be safe — 5 if everyone is prepared

At level 40, a party of Aegislash (Shield)'s top six counters needs 4.34 trainers (round up: 5), and a mixed lobby of ranks 13-24 needs 5.26 (round up: 6). The raid timer is 300 seconds and one prepared trainer alone would take 19:57. No level in this range makes it soloable with a prepared party.

Aegislash (Shield) · Elite

steelghost

Weak to

groundghostfiredark

Boss CP: 26,833
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 Aegislash (Shield) 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	7(7.00)	7(6.35)	8(7.51)	29:12	6.0
Level 25	6(5.28)	6(5.53)	7(6.50)	25:27	6.0
Level 30	5(4.35)	5(4.86)	6(5.80)	22:21	6.0
Level 35	5(4.20)	5(4.70)	6(5.50)	21:39	5.8
Level 40	4(3.93)	5(4.34)	6(5.26)	19:57	5.8
Level 45	4(3.82)	5(4.25)	6(5.07)	19:33	5.8
Level 50	4(3.72)	5(4.15)	5(4.90)	19:05	5.7

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.

4 trainers at level 40

Blacephalon3.93

A prepared party

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

5 trainers at level 40

Blacephalon3.93
Necrozma (Dawn Wings)4.00
Reshiram4.27
Landorus (Therian)4.40
Groudon4.71
Darkrai4.72

A mixed local group

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

6 trainers at level 40

Chandelure5.09
Darmanitan (Standard)5.13
Moltres5.18
Blaziken5.18
Ho-Oh5.22
Dragapult5.22

The party these numbers assume

1. Blacephalon

Astonish + Mind Blown

2. Necrozma (Dawn Wings)

Shadow Claw + Moongeist Beam

3. Reshiram

Fire Fang + Fusion Flare

4. Landorus (Therian)

Mud Shot + Sandsear Storm

5. Groudon

Mud Shot + Precipice Blades

6. Darkrai

Sucker Punch + Foul Play

See the full ranked counter list for Aegislash (Shield) · 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.