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 Silvally (Ice)'s top six counters needs 1.66 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.29 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 7:39. No level in this range makes it soloable with a prepared party. A duo works from level 30.

Silvally (Ice) · Tier 5

ice

Weak to

fightingrocksteelfire

Boss CP: 38,072
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 Silvally (Ice) 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(2.01)	3(2.35)	4(3.22)	10:48	5.9
Level 25	2(1.84)	3(2.02)	3(2.78)	9:18	5.7
Level 30	2(1.62)	2(1.82)	3(2.50)	8:23	5.3
Level 35	2(1.54)	2(1.75)	3(2.37)	8:03	5.1
Level 40	2(1.49)	2(1.66)	3(2.29)	7:39	4.9
Level 45	2(1.44)	2(1.60)	3(2.20)	7:22	4.8
Level 50	2(1.41)	2(1.55)	3(2.13)	7:08	4.6

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.

2 trainers at level 40

Zacian (Crowned Sword)1.49

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)1.49
Zamazenta (Crowned Shield)1.53
Necrozma (Dusk Mane)1.60
Blacephalon1.71
Keldeo1.73
Lucario1.91

A mixed local group

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

3 trainers at level 40

Chandelure2.23
Necrozma (Dawn Wings)2.25
Rampardos2.26
Cinderace2.26
Heatran2.28
Volcarona2.29

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. Blacephalon

Incinerate + Mind Blown

5. Keldeo

Low Kick + Secret Sword

6. Lucario

Force Palm + Aura Sphere

See the full ranked counter list for Silvally (Ice) · 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.