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 Slowpoke's top six counters needs 1.02 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.24 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 4:42. A prepared solo becomes possible at level 45. A duo works from level 20.

Slowpoke · Tier 5

waterpsychic

Weak to

bugghostgrasselectricdark

Boss CP: 16,143
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 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	2(1.29)	2(1.47)	2(1.74)	6:45	6.0
Level 25	2(1.07)	2(1.26)	2(1.52)	5:48	5.8
Level 30	1(0.98)	2(1.13)	2(1.36)	5:11	5.6
Level 35	1(0.94)	2(1.07)	2(1.29)	4:56	5.5
Level 40	1(0.89)	2(1.02)	2(1.24)	4:42	5.3
Level 45	1(0.85)	1(0.99)	2(1.20)	4:33	5.1
Level 50	1(0.85)	1(0.95)	2(1.16)	4:23	4.8

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.

1 trainer at level 40

Necrozma (Dawn Wings)0.89

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)0.89
Regieleki0.99
Kartana1.04
Thundurus (Therian)1.07
Zeraora1.07
Xurkitree1.09

A mixed local group

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

2 trainers at level 40

Absol1.21
Lunala1.22
Pheromosa1.22
Eternatus1.22
Rillaboom1.23
Dragapult1.23

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. Thundurus (Therian)

Volt Switch + Wildbolt Storm

5. Zeraora

Volt Switch + Plasma Fists

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.