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 Zapdos's top six counters needs 3.55 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.65 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 16:21. No level in this range makes it soloable with a prepared party.

Zapdos · Elite

electricflying

Weak to

rockice

Boss CP: 53,600
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 Zapdos 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(4.04)	6(5.32)	8(7.41)	24:29	6.0
Level 25	4(3.58)	5(4.52)	7(6.20)	20:47	6.0
Level 30	4(3.18)	5(4.01)	6(5.34)	18:27	6.0
Level 35	4(3.01)	4(3.80)	5(4.96)	17:30	6.0
Level 40	3(2.80)	4(3.55)	5(4.65)	16:21	6.0
Level 45	3(2.69)	4(3.43)	5(4.50)	15:46	6.0
Level 50	3(2.62)	4(3.34)	5(4.29)	15:22	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

Kyurem (White)2.80

A prepared party

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

4 trainers at level 40

Kyurem (White)2.80
Kyurem (Black)3.14
Eternatus3.64
Glimmora3.85
Rhyperior3.86
Tyrantrum4.02

A mixed local group

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

5 trainers at level 40

Tyranitar4.35
Regigigas4.53
Kyurem4.54
Mewtwo4.57
Cetitan4.60
Aurorus4.64

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Eternatus

Poison Jab + Dynamax Cannon

4. Glimmora

Rock Throw + Meteor Beam

5. Rhyperior

Smack Down + Rock Wrecker

6. Tyrantrum

Rock Throw + Meteor Beam

See the full ranked counter list for Zapdos · 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.