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 2 to be safe — 2 if everyone is prepared

At level 40, a party of Seviper's top six counters needs 1.30 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.56 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 5:59. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Seviper · Tier 5

poison

Weak to

groundpsychic

Boss CP: 29,802
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 Seviper 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	2(1.70)	2(1.85)	3(2.18)	8:30	5.9
Level 25	2(1.46)	2(1.60)	2(1.91)	7:23	5.7
Level 30	2(1.29)	2(1.45)	2(1.70)	6:41	5.4
Level 35	2(1.25)	2(1.37)	2(1.63)	6:19	5.3
Level 40	2(1.17)	2(1.30)	2(1.56)	5:59	5.2
Level 45	2(1.14)	2(1.26)	2(1.49)	5:49	5.1
Level 50	2(1.10)	2(1.23)	2(1.45)	5:40	5.0

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.

2 trainers at level 40

Mewtwo1.17

A prepared party

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

2 trainers at level 40

Mewtwo1.17
Hoopa (Unbound)1.25
Landorus (Therian)1.28
Necrozma (Dusk Mane)1.35
Necrozma (Dawn Wings)1.36
Groudon1.39

A mixed local group

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

2 trainers at level 40

Alakazam1.53
Excadrill1.51
Espeon1.52
Zamazenta (Crowned Shield)1.52
Metagross1.53
Mamoswine1.55

The party these numbers assume

1. Mewtwo

Psycho Cut + Psystrike

2. Hoopa (Unbound)

Confusion + Psychic

3. Landorus (Therian)

Extrasensory + 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 Seviper · 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.