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 Zamazenta's top six counters needs 2.40 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.83 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 11:04. No level in this range makes it soloable with a prepared party.

Zamazenta · Tier 5

fighting

Weak to

flyingpsychicfairy

Boss CP: 52,195
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 Zamazenta 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(3.66)	4(3.68)	5(4.47)	16:57	6.0
Level 25	4(3.20)	4(3.10)	4(3.70)	14:15	6.0
Level 30	3(2.87)	3(2.79)	4(3.17)	12:50	6.0
Level 35	3(2.35)	3(2.59)	3(2.98)	11:56	6.0
Level 40	3(2.22)	3(2.40)	3(2.83)	11:04	6.0
Level 45	3(2.11)	3(2.30)	3(2.74)	10:36	6.0
Level 50	3(2.05)	3(2.22)	3(2.64)	10:13	6.0

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

Rayquaza2.22

A prepared party

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

3 trainers at level 40

Rayquaza2.22
Mewtwo2.30
Enamorus (Incarnate)2.40
Galarian Articuno2.46
Zacian (Crowned Sword)2.50
Hoopa (Unbound)2.53

A mixed local group

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

3 trainers at level 40

Necrozma (Dawn Wings)2.70
Eternatus2.74
Salamence2.73
Lugia2.77
Lunala2.80
Staraptor2.86

The party these numbers assume

1. Rayquaza

Air Slash + Dragon Ascent

2. Mewtwo

Confusion + Psystrike

3. Enamorus (Incarnate)

Fairy Wind + Fly

4. Galarian Articuno

Psycho Cut + Fly

5. Zacian (Crowned Sword)

Air Slash + Play Rough

6. Hoopa (Unbound)

Confusion + Psychic

See the full ranked counter list for Zamazenta · 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.