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 Galvantula's top six counters needs 1.44 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.67 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 6:36. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Galvantula · Tier 5

bugelectric

Weak to

rockfire

Boss CP: 31,634
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 Galvantula 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(1.82)	3(2.07)	3(2.39)	9:32	5.9
Level 25	2(1.54)	2(1.78)	3(2.05)	8:12	5.8
Level 30	2(1.35)	2(1.59)	2(1.83)	7:18	5.6
Level 35	2(1.25)	2(1.51)	2(1.74)	6:56	5.5
Level 40	2(1.18)	2(1.44)	2(1.67)	6:36	5.4
Level 45	2(1.13)	2(1.38)	2(1.61)	6:22	5.3
Level 50	2(1.09)	2(1.35)	2(1.55)	6:12	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

Blacephalon1.18

A prepared party

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

2 trainers at level 40

Blacephalon1.18
Reshiram1.33
Cinderace1.50
Heatran1.51
Volcarona1.55
Glimmora1.55

A mixed local group

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

2 trainers at level 40

Delphox1.62
Moltres1.64
Emboar1.63
Kyurem (White)1.66
Victini1.67
Kyurem (Black)1.68

The party these numbers assume

1. Blacephalon

Incinerate + Mind Blown

2. Reshiram

Fire Fang + Fusion Flare

3. Cinderace

Fire Spin + Pyroball

4. Heatran

Fire Spin + Magma Storm

5. Volcarona

Fire Spin + Overheat

6. Glimmora

Rock Throw + Meteor Beam

See the full ranked counter list for Galvantula · 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.