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 — 2 if everyone is prepared

At level 40, a party of Volcarona's top six counters needs 1.64 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.09 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 7:32. No level in this range makes it soloable with a prepared party. A duo works from level 30.

Volcarona · Tier 5

bugfire

Weak to

rockflyingwater

Boss CP: 48,805
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 Volcarona 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	3(2.35)	3(2.52)	4(3.27)	11:37	6.0
Level 25	3(2.03)	3(2.15)	3(2.70)	9:55	6.0
Level 30	2(1.61)	2(1.83)	3(2.31)	8:24	6.0
Level 35	2(1.55)	2(1.74)	3(2.19)	8:00	6.0
Level 40	2(1.49)	2(1.64)	3(2.09)	7:32	6.0
Level 45	2(1.42)	2(1.58)	2(1.99)	7:16	6.0
Level 50	2(1.36)	2(1.50)	2(1.91)	6:55	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.

2 trainers at level 40

Glimmora1.49

A prepared party

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

2 trainers at level 40

Glimmora1.49
Rampardos1.55
Tyrantrum1.59
Rhyperior1.70
Tyranitar1.73
Terrakion1.76

A mixed local group

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

3 trainers at level 40

Stakataka1.95
Lycanroc (Dusk)2.01
Lycanroc (Midday)2.02
Archeops2.06
Nihilego2.08
Kyurem (White)2.12

The party these numbers assume

1. Glimmora

Rock Throw + Meteor Beam

2. Rampardos

Smack Down + Rock Slide

3. Tyrantrum

Rock Throw + Meteor Beam

4. Rhyperior

Smack Down + Rock Wrecker

5. Tyranitar

Smack Down + Stone Edge

6. Terrakion

Smack Down + Rock Slide

See the full ranked counter list for Volcarona · 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.