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 1.00 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.16 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 2:56. A prepared solo becomes possible at level 45. A duo works from level 20.

Galvantula · Shadow Tier 3

bugelectric

Weak to

rockfire

Boss CP: 16,336
Boss HP: 4,000
Raid timer: 180s
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(1.35)	2(1.52)	2(1.68)	4:27	5.8
Level 25	2(1.10)	2(1.28)	2(1.46)	3:45	5.5
Level 30	1(0.94)	2(1.12)	2(1.28)	3:17	5.1
Level 35	1(0.90)	2(1.07)	2(1.23)	3:08	4.8
Level 40	1(0.84)	2(1.00)	2(1.16)	2:56	4.5
Level 45	1(0.80)	1(0.97)	2(1.11)	2:51	4.3
Level 50	1(0.78)	1(0.95)	2(1.07)	2:46	4.1

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.

1 trainer at level 40

Blacephalon0.84

A prepared party

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

2 trainers at level 40

Blacephalon0.84
Reshiram0.92
Cinderace1.07
Blaziken1.07
Rampardos1.06
Heatran1.08

A mixed local group

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

2 trainers at level 40

Kyurem (White)1.16
Gigalith1.13
Moltres1.15
Delphox1.16
Infernape1.15
Kyurem (Black)1.15

The party these numbers assume

1. Blacephalon

Incinerate + Mind Blown

2. Reshiram

Fire Fang + Fusion Flare

3. Cinderace

Fire Spin + Pyroball

4. Blaziken

Fire Spin + Blast Burn

5. Rampardos

Smack Down + Rock Slide

6. Heatran

Fire Spin + Magma Storm

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.