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 Silvally (Poison)'s top six counters needs 2.07 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.50 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 9:32. No level in this range makes it soloable with a prepared party. A duo works from level 45.

Silvally (Poison) · Tier 5

poison

Weak to

groundpsychic

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 (Poison) 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(2.60)	3(2.95)	4(3.58)	13:36	6.0
Level 25	3(2.34)	3(2.55)	4(3.08)	11:45	5.9
Level 30	3(2.05)	3(2.30)	3(2.71)	10:34	5.8
Level 35	2(1.97)	3(2.16)	3(2.61)	9:57	5.7
Level 40	2(1.90)	3(2.07)	3(2.50)	9:32	5.5
Level 45	2(1.82)	2(2.00)	3(2.37)	9:12	5.4
Level 50	2(1.72)	2(1.94)	3(2.30)	8:57	5.3

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

Mewtwo1.90

A prepared party

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

3 trainers at level 40

Mewtwo1.90
Hoopa (Unbound)2.05
Landorus (Therian)2.06
Necrozma (Dusk Mane)2.09
Necrozma (Dawn Wings)2.10
Groudon2.22

A mixed local group

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

3 trainers at level 40

Alakazam2.40
Metagross2.42
Zacian (Crowned Sword)2.44
Zamazenta (Crowned Shield)2.44
Espeon2.43
Mamoswine2.52

The party these numbers assume

1. Mewtwo

Psycho Cut + Psystrike

2. Hoopa (Unbound)

Confusion + Psychic

3. Landorus (Therian)

Mud Shot + Sandsear Storm

4. Necrozma (Dusk Mane)

Psycho Cut + Sunsteel Strike

5. Necrozma (Dawn Wings)

Psycho Cut + Moongeist Beam

6. Groudon

Mud Shot + Precipice Blades

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