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 Arbok's top six counters needs 2.98 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.51 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 14:05. No level in this range makes it soloable with a prepared party.

Arbok · Shadow Tier 5

poison

Weak to

groundpsychic

Boss CP: 28,891
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 Arbok 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	4(3.82)	5(4.29)	6(5.36)	20:16	5.8
Level 25	4(3.37)	4(3.58)	5(4.49)	16:54	5.7
Level 30	3(2.96)	4(3.25)	4(3.87)	15:22	5.5
Level 35	3(2.82)	4(3.14)	4(3.67)	14:49	5.5
Level 40	3(2.71)	3(2.98)	4(3.51)	14:05	5.4
Level 45	3(2.59)	3(2.88)	4(3.38)	13:37	5.4
Level 50	3(2.47)	3(2.77)	4(3.28)	13:06	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.

3 trainers at level 40

Mewtwo2.71

A prepared party

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

3 trainers at level 40

Mewtwo2.71
Hoopa (Unbound)2.87
Landorus (Therian)2.95
Necrozma (Dusk Mane)3.04
Groudon3.15
Zacian (Crowned Sword)3.16

A mixed local group

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

4 trainers at level 40

Metagross3.44
Alakazam3.43
Latios3.40
Hoopa3.49
Garchomp3.45
Espeon3.50

The party these numbers assume

1. Mewtwo

Confusion + Psystrike

2. Hoopa (Unbound)

Confusion + Psychic

3. Landorus (Therian)

Mud Shot + Sandsear Storm

4. Necrozma (Dusk Mane)

Psycho Cut + Sunsteel Strike

5. Groudon

Mud Shot + Precipice Blades

6. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

See the full ranked counter list for Arbok · 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.