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 — 1 if everyone is prepared

At level 40, a party of Umbreon's top six counters needs 0.81 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 1.00 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 2:21. A prepared solo becomes possible at level 25. A duo works from level 20.

Umbreon · Tier 3

dark

Weak to

fightingbugfairy

Boss CP: 13,509
Boss HP: 3,600
Raid timer: 180s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Umbreon 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	1(0.96)	2(1.13)	2(1.40)	3:18	5.2
Level 25	1(0.87)	1(0.99)	2(1.24)	2:53	4.5
Level 30	1(0.77)	1(0.87)	2(1.10)	2:33	3.6
Level 35	1(0.74)	1(0.84)	2(1.04)	2:27	3.2
Level 40	1(0.72)	1(0.81)	2(1.00)	2:21	2.9
Level 45	1(0.70)	1(0.79)	1(0.97)	2:19	2.5
Level 50	1(0.69)	1(0.76)	1(0.94)	2:14	2.3

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

Keldeo0.72

A prepared party

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

1 trainer at level 40

Keldeo0.72
Lucario0.77
Kartana0.80
Terrakion0.82
Blaziken0.85
Pheromosa0.86

A mixed local group

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

2 trainers at level 40

Breloom0.96
Eternatus0.96
Zamazenta (Crowned Shield)0.98
Tapu Koko0.99
Volcarona1.00
Marshadow1.00

The party these numbers assume

1. Keldeo

Low Kick + Secret Sword

2. Lucario

Force Palm + Aura Sphere

3. Kartana

Fury Cutter + Sacred Sword

4. Terrakion

Double Kick + Sacred Sword

5. Blaziken

Counter + Aura Sphere

6. Pheromosa

Bug Bite + Bug Buzz

See the full ranked counter list for Umbreon · 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.