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 1 to be safe — 1 if everyone is prepared

At level 40, a party of Hoopa (Unbound)'s top six counters needs 0.55 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 0.68 (round up: 1). The raid timer is 180 seconds and one prepared trainer alone would take 1:37. A prepared solo becomes possible at level 20. A duo works from level 20.

Hoopa (Unbound) · Tier 3

psychicdark

Weak to

bugfairy

Boss CP: 28,073
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 Hoopa (Unbound) 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(0.99)	1(0.84)	2(1.07)	2:28	6.0
Level 25	1(0.71)	1(0.70)	1(0.89)	2:04	5.9
Level 30	1(0.62)	1(0.64)	1(0.76)	1:52	5.4
Level 35	1(0.60)	1(0.59)	1(0.71)	1:43	4.9
Level 40	1(0.53)	1(0.55)	1(0.68)	1:37	4.2
Level 45	1(0.51)	1(0.53)	1(0.65)	1:32	3.6
Level 50	1(0.50)	1(0.50)	1(0.62)	1:29	3.4

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

Kartana0.53

A prepared party

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

1 trainer at level 40

Kartana0.53
Volcarona0.55
Genesect0.55
Genesect (Burn)0.55
Genesect (Chill)0.55
Genesect (Douse)0.55

A mixed local group

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

1 trainer at level 40

Golisopod0.62
Centiskorch0.62
Escavalier0.66
Yanmega0.66
Durant0.68
Frosmoth0.67

The party these numbers assume

1. Kartana

Fury Cutter + X-Scissor

2. Volcarona

Bug Bite + Bug Buzz

3. Genesect

Fury Cutter + X-Scissor

4. Genesect (Burn)

Fury Cutter + X-Scissor

5. Genesect (Chill)

Fury Cutter + X-Scissor

6. Genesect (Douse)

Fury Cutter + X-Scissor

See the full ranked counter list for Hoopa (Unbound) · 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.