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 Galvantula's top six counters needs 2.44 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.80 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 11:14. No level in this range makes it soloable with a prepared party.

Galvantula · Elite

bugelectric

Weak to

rockfire

Boss CP: 36,528
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 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	4(3.36)	4(3.61)	5(4.09)	16:36	6.0
Level 25	3(2.67)	4(3.08)	4(3.50)	14:12	5.9
Level 30	3(2.33)	3(2.68)	4(3.08)	12:21	5.9
Level 35	3(2.20)	3(2.56)	3(2.95)	11:46	5.9
Level 40	3(2.07)	3(2.44)	3(2.80)	11:14	5.8
Level 45	2(1.97)	3(2.35)	3(2.69)	10:48	5.7
Level 50	2(1.89)	3(2.27)	3(2.60)	10:27	5.6

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

Blacephalon2.07

A prepared party

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

3 trainers at level 40

Blacephalon2.07
Reshiram2.23
Heatran2.55
Chandelure2.59
Cinderace2.59
Volcarona2.61

A mixed local group

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

3 trainers at level 40

Emboar2.73
Kyurem (White)2.75
Moltres2.75
Victini2.76
Delphox2.80
Necrozma (Dawn Wings)2.83

The party these numbers assume

1. Blacephalon

Incinerate + Mind Blown

2. Reshiram

Fire Fang + Fusion Flare

3. Heatran

Fire Spin + Magma Storm

4. Chandelure

Fire Spin + Overheat

5. Cinderace

Fire Spin + Pyroball

6. Volcarona

Fire Spin + Overheat

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.