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 Aggron's top six counters needs 2.90 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.68 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 13:43. No level in this range makes it soloable with a prepared party.

Aggron · Shadow Tier 5

steelrock

Weak to

fightinggroundwater

Boss CP: 43,023
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 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	4(3.60)	5(4.44)	6(5.52)	20:59	6.0
Level 25	4(3.06)	4(3.72)	5(4.71)	17:33	6.0
Level 30	3(2.75)	4(3.21)	5(4.11)	15:11	6.0
Level 35	3(2.55)	4(3.04)	4(3.86)	14:23	6.0
Level 40	3(2.45)	3(2.90)	4(3.68)	13:43	6.0
Level 45	3(2.39)	3(2.83)	4(3.56)	13:21	6.0
Level 50	3(2.31)	3(2.68)	4(3.43)	12:41	5.9

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

Keldeo2.45

A prepared party

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

3 trainers at level 40

Keldeo2.45
Lucario2.83
Terrakion2.89
Blaziken3.02
Landorus (Therian)3.07
Groudon3.17

A mixed local group

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

4 trainers at level 40

Garchomp3.53
Marshadow3.51
Machamp3.60
Breloom3.68
Raikou3.71
Landorus (Incarnate)3.70

The party these numbers assume

1. Keldeo

Low Kick + Secret Sword

2. Lucario

Force Palm + Aura Sphere

3. Terrakion

Double Kick + Sacred Sword

4. Blaziken

Counter + Aura Sphere

5. Landorus (Therian)

Mud Shot + Sandsear Storm

6. Groudon

Mud Shot + Precipice Blades

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.