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 Aggron's top six counters needs 1.14 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.44 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 3:20. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Aggron · Shadow Tier 3

steelrock

Weak to

fightinggroundwater

Boss CP: 22,217
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 Aggron 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(1.43)	2(1.67)	3(2.15)	4:54	6.0
Level 25	2(1.23)	2(1.45)	2(1.82)	4:15	6.0
Level 30	2(1.05)	2(1.27)	2(1.59)	3:43	5.7
Level 35	2(1.00)	2(1.21)	2(1.51)	3:32	5.5
Level 40	1(0.98)	2(1.14)	2(1.44)	3:20	5.4
Level 45	1(0.95)	2(1.10)	2(1.39)	3:14	5.3
Level 50	1(0.93)	2(1.07)	2(1.34)	3:08	5.1

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

Keldeo0.98

A prepared party

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

2 trainers at level 40

Keldeo0.98
Lucario1.10
Terrakion1.12
Landorus (Therian)1.14
Blaziken1.20
Urshifu (Rapid Strike)1.29

A mixed local group

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

2 trainers at level 40

Marshadow1.38
Garchomp1.41
Breloom1.40
Pheromosa1.40
Mewtwo1.43
Machamp1.43

The party these numbers assume

1. Keldeo

Low Kick + Secret Sword

2. Lucario

Force Palm + Aura Sphere

3. Terrakion

Double Kick + Sacred Sword

4. Landorus (Therian)

Mud Shot + Sandsear Storm

5. Blaziken

Counter + Aura Sphere

6. Urshifu (Rapid Strike)

Counter + Dynamic Punch

See the full ranked counter list for Aggron · 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.