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 4 to be safe — 3 if everyone is prepared

At level 40, a party of Volcarona's top six counters needs 2.81 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.56 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 12:57. No level in this range makes it soloable with a prepared party.

Volcarona · Elite

bugfire

Weak to

rockflyingwater

Boss CP: 56,355
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 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	5(4.42)	5(4.63)	6(5.72)	21:18	6.0
Level 25	4(3.48)	4(3.64)	5(4.79)	16:45	6.0
Level 30	4(3.13)	4(3.29)	5(4.14)	15:07	6.0
Level 35	3(2.93)	4(3.06)	4(3.82)	14:04	6.0
Level 40	3(2.58)	3(2.81)	4(3.56)	12:57	6.0
Level 45	3(2.39)	3(2.69)	4(3.42)	12:23	6.0
Level 50	3(2.33)	3(2.59)	4(3.29)	11:56	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

Glimmora2.58

A prepared party

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

3 trainers at level 40

Glimmora2.58
Tyrantrum2.66
Rampardos2.71
Rhyperior2.90
Terrakion2.98
Rayquaza3.04

A mixed local group

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

4 trainers at level 40

Nihilego3.38
Landorus (Incarnate)3.44
Lycanroc (Midday)3.46
Lycanroc (Dusk)3.46
Moltres3.59
Omastar3.55

The party these numbers assume

1. Glimmora

Rock Throw + Meteor Beam

2. Tyrantrum

Rock Throw + Meteor Beam

3. Rampardos

Smack Down + Rock Slide

4. Rhyperior

Smack Down + Rock Wrecker

5. Terrakion

Smack Down + Rock Slide

6. Rayquaza

Air Slash + Dragon Ascent

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.