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 Urshifu (Single Strike)'s top six counters needs 1.44 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.82 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 6:39. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Urshifu (Single Strike) · Tier 5

fightingdark

Weak to

fairyfightingflying

Boss CP: 45,650
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 Urshifu (Single Strike) 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(1.89)	3(2.08)	3(2.71)	9:34	6.0
Level 25	2(1.63)	2(1.79)	3(2.26)	8:14	6.0
Level 30	2(1.45)	2(1.59)	3(2.00)	7:19	6.0
Level 35	2(1.39)	2(1.52)	2(1.91)	6:59	5.9
Level 40	2(1.32)	2(1.44)	2(1.82)	6:39	5.9
Level 45	2(1.28)	2(1.39)	2(1.76)	6:23	5.8
Level 50	2(1.23)	2(1.34)	2(1.68)	6:10	5.7

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

Enamorus (Incarnate)1.32

A prepared party

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

2 trainers at level 40

Enamorus (Incarnate)1.32
Zacian (Crowned Sword)1.40
Enamorus (Therian)1.45
Tapu Koko1.48
Xerneas1.49
Tapu Lele1.53

A mixed local group

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

2 trainers at level 40

Zacian1.71
Granbull1.72
Primarina1.73
Rayquaza1.73
Sylveon1.76
Galarian Rapidash1.81

The party these numbers assume

1. Enamorus (Incarnate)

Fairy Wind + Dazzling Gleam

2. Zacian (Crowned Sword)

Metal Claw + Play Rough

3. Enamorus (Therian)

Fairy Wind + Dazzling Gleam

4. Tapu Koko

Volt Switch + Nature's Madness

5. Xerneas

Geomancy + Moonblast

6. Tapu Lele

Astonish + Nature's Madness

See the full ranked counter list for Urshifu (Single Strike) · 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.