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 Archeops's top six counters needs 2.16 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.91 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 9:56. No level in this range makes it soloable with a prepared party. A duo works from level 50.

Archeops · Elite

rockflying

Weak to

rocksteelwaterelectricice

Boss CP: 53,878
Boss HP: 20,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Archeops 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(2.74)	4(3.67)	5(4.41)	16:53	6.0
Level 25	3(2.28)	3(2.91)	4(3.73)	13:22	6.0
Level 30	3(2.02)	3(2.37)	4(3.27)	10:55	5.9
Level 35	2(1.90)	3(2.28)	4(3.07)	10:28	5.9
Level 40	2(1.83)	3(2.16)	3(2.91)	9:56	5.9
Level 45	2(1.80)	3(2.07)	3(2.82)	9:33	5.8
Level 50	2(1.71)	2(2.00)	3(2.70)	9:12	5.8

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)1.83

A prepared party

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

3 trainers at level 40

Zacian (Crowned Sword)1.83
Zamazenta (Crowned Shield)1.91
Necrozma (Dusk Mane)2.01
Kyurem (White)2.23
Kyurem (Black)2.44
Regieleki2.52

A mixed local group

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

3 trainers at level 40

Kyogre2.78
Quaquaval2.85
Melmetal2.85
Dialga (Origin)2.89
Rampardos2.91
Necrozma (Dawn Wings)2.91

The party these numbers assume

1. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

2. Zamazenta (Crowned Shield)

Ice Fang + Behemoth Bash

3. Necrozma (Dusk Mane)

Metal Claw + Sunsteel Strike

4. Kyurem (White)

Ice Fang + Ice Burn

5. Kyurem (Black)

Dragon Tail + Freeze Shock

6. Regieleki

Thunder Shock + Thunder Cage

See the full ranked counter list for Archeops · 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.