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 — 2 if everyone is prepared

At level 40, a party of Slowpoke's top six counters needs 1.72 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.07 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 7:54. No level in this range makes it soloable with a prepared party. A duo works from level 30.

Slowpoke · Elite

waterpsychic

Weak to

bugghostgrasselectricdark

Boss CP: 18,641
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 Slowpoke 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(2.10)	3(2.49)	3(2.92)	11:27	6.0
Level 25	2(1.88)	3(2.16)	3(2.53)	9:56	6.0
Level 30	2(1.67)	2(1.91)	3(2.27)	8:48	5.9
Level 35	2(1.61)	2(1.81)	3(2.17)	8:20	5.9
Level 40	2(1.47)	2(1.72)	3(2.07)	7:54	5.8
Level 45	2(1.44)	2(1.67)	2(1.99)	7:41	5.7
Level 50	2(1.40)	2(1.59)	2(1.93)	7:19	5.6

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

Necrozma (Dawn Wings)1.47

A prepared party

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

2 trainers at level 40

Necrozma (Dawn Wings)1.47
Regieleki1.68
Kartana1.75
Zeraora1.79
Thundurus (Therian)1.79
Xurkitree1.81

A mixed local group

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

3 trainers at level 40

Blacephalon2.00
Zarude2.02
Eternatus2.04
Absol2.05
Dragapult2.07
Rillaboom2.07

The party these numbers assume

1. Necrozma (Dawn Wings)

Psycho Cut + Moongeist Beam

2. Regieleki

Lock-On + Thunder Cage

3. Kartana

Fury Cutter + Leaf Blade

4. Zeraora

Volt Switch + Plasma Fists

5. Thundurus (Therian)

Volt Switch + Wildbolt Storm

6. Xurkitree

Thunder Shock + Discharge

See the full ranked counter list for Slowpoke · 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.