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 7 to be safe — 6 if everyone is prepared

At level 40, a party of Primal Kyogre's top six counters needs 5.39 trainers (round up: 6), and a mixed lobby of ranks 13-24 needs 6.61 (round up: 7). The raid timer is 300 seconds and one prepared trainer alone would take 24:48. No level in this range makes it soloable with a prepared party.

Primal Kyogre · Super Mega

water

Weak to

grasselectric

Boss CP: 97,883
Boss HP: 25,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Primal Kyogre 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	9(8.86)	9(8.81)	11(10.12)	40:32	6.0
Level 25	8(7.14)	8(7.57)	9(8.62)	34:49	6.0
Level 30	7(6.54)	7(6.49)	8(7.39)	29:52	6.0
Level 35	6(5.47)	6(5.81)	7(6.96)	26:45	6.0
Level 40	6(5.21)	6(5.39)	7(6.61)	24:48	6.0
Level 45	6(5.11)	6(5.21)	7(6.33)	24:00	6.0
Level 50	5(4.92)	5(4.93)	7(6.01)	22:43	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.

6 trainers at level 40

Zarude5.21

A prepared party

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

6 trainers at level 40

Zarude5.21
Zeraora5.16
Eternatus5.31
Kartana5.43
Raikou5.58
Kyurem (Black)5.63

A mixed local group

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

7 trainers at level 40

Electivire6.32
Regigigas6.39
Tapu Bulu6.54
Magnezone6.40
Keldeo6.44
Shaymin (Land)6.50

The party these numbers assume

1. Zarude

Vine Whip + Power Whip

2. Zeraora

Volt Switch + Plasma Fists

3. Eternatus

Poison Jab + Dynamax Cannon

4. Kartana

Razor Leaf + Leaf Blade

5. Raikou

Thunder Shock + Wild Charge

6. Kyurem (Black)

Dragon Tail + Fusion Bolt

See the full ranked counter list for Primal Kyogre · 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.