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 3 to be safe — 3 if everyone is prepared

At level 40, a party of Zeraora's top six counters needs 2.12 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.66 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 9:47. No level in this range makes it soloable with a prepared party. A duo works from level 50.

Zeraora · Tier 5

electric

Weak to

ground

Boss CP: 45,311
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 Zeraora 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	3(2.76)	4(3.00)	4(3.89)	13:50	5.8
Level 25	3(2.27)	3(2.59)	4(3.30)	11:54	5.6
Level 30	3(2.08)	3(2.31)	3(2.96)	10:37	5.4
Level 35	2(1.99)	3(2.21)	3(2.84)	10:10	5.3
Level 40	2(1.84)	3(2.12)	3(2.66)	9:47	5.2
Level 45	2(1.78)	3(2.06)	3(2.57)	9:28	5.0
Level 50	2(1.75)	2(1.99)	3(2.50)	9:09	4.9

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.

2 trainers at level 40

Landorus (Therian)1.84

A prepared party

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

3 trainers at level 40

Landorus (Therian)1.84
Groudon2.03
Eternatus2.12
Garchomp2.21
Excadrill2.26
Landorus (Incarnate)2.29

A mixed local group

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

3 trainers at level 40

Golurk2.52
Krookodile2.52
Keldeo2.59
Rhydon2.59
Ursaluna2.68
Donphan2.67

The party these numbers assume

1. Landorus (Therian)

Mud Shot + Sandsear Storm

2. Groudon

Mud Shot + Precipice Blades

3. Eternatus

Poison Jab + Dynamax Cannon

4. Garchomp

Mud Shot + Earth Power

5. Excadrill

Mud-Slap + Scorching Sands

6. Landorus (Incarnate)

Mud Shot + Earth Power

See the full ranked counter list for Zeraora · 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.