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 Arceus (Electric)'s top six counters needs 2.89 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.62 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 13:18. No level in this range makes it soloable with a prepared party.

Arceus (Electric) · Tier 5

electric

Weak to

ground

Boss CP: 49,286
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 Arceus (Electric) 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	5(4.20)	5(4.33)	6(5.58)	19:55	6.0
Level 25	4(3.35)	4(3.65)	5(4.67)	16:49	6.0
Level 30	3(2.84)	4(3.20)	5(4.06)	14:43	6.0
Level 35	3(2.77)	4(3.04)	4(3.86)	13:58	6.0
Level 40	3(2.62)	3(2.89)	4(3.62)	13:18	6.0
Level 45	3(2.52)	3(2.79)	4(3.47)	12:49	6.0
Level 50	3(2.50)	3(2.71)	4(3.35)	12:29	6.0

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.

3 trainers at level 40

Landorus (Therian)2.62

A prepared party

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

3 trainers at level 40

Landorus (Therian)2.62
Groudon2.77
Excadrill2.95
Eternatus2.93
Necrozma (Dawn Wings)2.97
Landorus (Incarnate)3.11

A mixed local group

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

4 trainers at level 40

Kyurem (White)3.42
Krookodile3.51
Rhydon3.51
Golurk3.55
Ursaluna3.61
Dialga (Origin)3.61

The party these numbers assume

1. Landorus (Therian)

Mud Shot + Sandsear Storm

2. Groudon

Mud Shot + Precipice Blades

3. Excadrill

Mud-Slap + Scorching Sands

4. Eternatus

Poison Jab + Dynamax Cannon

5. Necrozma (Dawn Wings)

Psycho Cut + Moongeist Beam

6. Landorus (Incarnate)

Mud Shot + Earth Power

See the full ranked counter list for Arceus (Electric) · 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.