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 2 to be safe — 2 if everyone is prepared

At level 40, a party of Calyrex's top six counters needs 1.33 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.52 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 6:07. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Calyrex · Tier 5

psychicgrass

Weak to

bugflyingpoisonghostfireice

Boss CP: 28,840
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 Calyrex 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	2(1.86)	2(1.84)	3(2.19)	8:27	6.0
Level 25	2(1.58)	2(1.62)	2(1.88)	7:29	5.9
Level 30	2(1.42)	2(1.46)	2(1.66)	6:43	5.6
Level 35	2(1.35)	2(1.40)	2(1.60)	6:28	5.6
Level 40	2(1.29)	2(1.33)	2(1.52)	6:07	5.3
Level 45	2(1.25)	2(1.29)	2(1.46)	5:56	5.2
Level 50	2(1.22)	2(1.26)	2(1.41)	5:48	5.1

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

Volcarona1.29

A prepared party

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

2 trainers at level 40

Volcarona1.29
Kartana1.33
Genesect1.34
Genesect (Burn)1.34
Genesect (Chill)1.34
Genesect (Douse)1.34

A mixed local group

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

2 trainers at level 40

Kyurem (White)1.47
Escavalier1.47
Pinsir1.49
Yanmega1.49
Kyurem (Black)1.52
Rayquaza1.51

The party these numbers assume

1. Volcarona

Bug Bite + Bug Buzz

2. Kartana

Fury Cutter + X-Scissor

3. Genesect

Fury Cutter + X-Scissor

4. Genesect (Burn)

Fury Cutter + X-Scissor

5. Genesect (Chill)

Fury Cutter + X-Scissor

6. Genesect (Douse)

Fury Cutter + X-Scissor

See the full ranked counter list for Calyrex · 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.