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 — 2 if everyone is prepared

At level 40, a party of Glastrier's top six counters needs 1.90 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.64 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 8:44. No level in this range makes it soloable with a prepared party. A duo works from level 35.

Glastrier · Tier 5

ice

Weak to

fightingrocksteelfire

Boss CP: 49,314
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 Glastrier 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	3(2.43)	3(2.92)	5(4.07)	13:27	6.0
Level 25	3(2.11)	3(2.56)	4(3.31)	11:47	6.0
Level 30	2(1.93)	3(2.18)	3(2.92)	10:01	6.0
Level 35	2(1.77)	2(2.00)	3(2.79)	9:11	5.9
Level 40	2(1.69)	2(1.90)	3(2.64)	8:44	5.9
Level 45	2(1.67)	2(1.86)	3(2.55)	8:33	5.8
Level 50	2(1.62)	2(1.80)	3(2.45)	8:17	5.7

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

Zacian (Crowned Sword)1.69

A prepared party

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

2 trainers at level 40

Zacian (Crowned Sword)1.69
Zamazenta (Crowned Shield)1.73
Necrozma (Dusk Mane)1.74
Keldeo1.95
Blacephalon2.06
Lucario2.21

A mixed local group

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

3 trainers at level 40

Kartana2.56
Urshifu (Single Strike)2.59
Cinderace2.58
Heatran2.61
Conkeldurr2.63
Volcarona2.64

The party these numbers assume

1. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

2. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

3. Necrozma (Dusk Mane)

Metal Claw + Sunsteel Strike

4. Keldeo

Low Kick + Secret Sword

5. Blacephalon

Incinerate + Mind Blown

6. Lucario

Force Palm + Aura Sphere

See the full ranked counter list for Glastrier · 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.