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 5 to be safe — 4 if everyone is prepared

At level 40, a party of Zeraora's top six counters needs 3.58 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.48 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 16:28. No level in this range makes it soloable with a prepared party.

Zeraora · Elite

electric

Weak to

ground

Boss CP: 52,321
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 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	5(4.72)	6(5.12)	7(6.58)	23:33	5.9
Level 25	4(3.91)	5(4.45)	6(5.69)	20:28	5.8
Level 30	4(3.46)	4(3.87)	5(4.97)	17:48	5.7
Level 35	4(3.37)	4(3.70)	5(4.72)	17:03	5.5
Level 40	4(3.29)	4(3.58)	5(4.48)	16:28	5.5
Level 45	3(2.96)	4(3.44)	5(4.31)	15:49	5.4
Level 50	3(2.83)	4(3.30)	5(4.21)	15:11	5.3

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

Landorus (Therian)3.29

A prepared party

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

4 trainers at level 40

Landorus (Therian)3.29
Groudon3.39
Eternatus3.54
Garchomp3.68
Excadrill3.75
Kyurem (Black)3.82

A mixed local group

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

5 trainers at level 40

Rhydon4.25
Krookodile4.26
Kyurem (White)4.36
Mudsdale4.41
Donphan4.46
Mewtwo4.59

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. Kyurem (Black)

Dragon Tail + Freeze Shock

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.