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 Volcanion's top six counters needs 2.51 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.98 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 11:34. No level in this range makes it soloable with a prepared party.

Volcanion · Tier 5

firewater

Weak to

groundrockelectric

Boss CP: 49,700
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 Volcanion 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(4.28)	5(4.07)	5(4.75)	18:45	6.0
Level 25	4(3.32)	4(3.39)	4(3.94)	15:36	6.0
Level 30	3(2.69)	3(2.86)	4(3.37)	13:11	6.0
Level 35	3(2.55)	3(2.70)	4(3.18)	12:24	6.0
Level 40	3(2.39)	3(2.51)	3(2.98)	11:34	6.0
Level 45	3(2.32)	3(2.39)	3(2.87)	10:59	6.0
Level 50	3(2.24)	3(2.27)	3(2.77)	10:27	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

Zeraora2.39

A prepared party

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

3 trainers at level 40

Zeraora2.39
Zekrom2.42
Xurkitree2.48
Thundurus (Therian)2.53
Eternatus2.63
Landorus (Therian)2.63

A mixed local group

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

3 trainers at level 40

Garchomp2.76
Tyrantrum2.79
Zapdos2.80
Rampardos2.94
Luxray3.03
Mewtwo3.00

The party these numbers assume

1. Zeraora

Spark + Plasma Fists

2. Zekrom

Charge Beam + Fusion Bolt

3. Xurkitree

Thunder Shock + Discharge

4. Thundurus (Therian)

Volt Switch + Wildbolt Storm

5. Eternatus

Poison Jab + Dynamax Cannon

6. Landorus (Therian)

Mud Shot + Sandsear Storm

See the full ranked counter list for Volcanion · 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.