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 Banette's top six counters needs 2.67 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.05 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 12:16. No level in this range makes it soloable with a prepared party.

Banette · Elite

ghost

Weak to

ghostdark

Boss CP: 39,127
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 Banette 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(4.18)	5(4.08)	6(5.07)	18:46	6.0
Level 25	4(3.62)	4(3.38)	5(4.16)	15:33	6.0
Level 30	3(2.77)	3(2.90)	4(3.50)	13:21	6.0
Level 35	3(2.61)	3(2.80)	4(3.23)	12:53	6.0
Level 40	3(2.51)	3(2.67)	4(3.05)	12:16	6.0
Level 45	3(2.42)	3(2.58)	3(2.89)	11:52	6.0
Level 50	3(2.32)	3(2.49)	3(2.73)	11:28	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

Darkrai2.51

A prepared party

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

3 trainers at level 40

Darkrai2.51
Eternatus2.60
Tyranitar2.68
Kyurem (Black)2.71
Zamazenta (Crowned Shield)2.73
Zacian (Crowned Sword)2.77

A mixed local group

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

4 trainers at level 40

Necrozma (Dusk Mane)2.90
Weavile2.92
Dragapult2.97
Hoopa (Unbound)3.00
Guzzlord3.07
Salamence3.04

The party these numbers assume

1. Darkrai

Snarl + Foul Play

2. Eternatus

Dragon Tail + Dynamax Cannon

3. Tyranitar

Bite + Brutal Swing

4. Kyurem (Black)

Shadow Claw + Freeze Shock

5. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

6. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

See the full ranked counter list for Banette · 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.