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 Hatenna's top six counters needs 1.07 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.23 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 4:56. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Hatenna · Tier 5

psychic

Weak to

bugghostdark

Boss CP: 14,382
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 Hatenna 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(1.21)	2(1.52)	2(1.73)	7:00	5.8
Level 25	2(1.03)	2(1.31)	2(1.51)	6:01	5.3
Level 30	1(0.95)	2(1.18)	2(1.34)	5:25	4.9
Level 35	1(0.89)	2(1.13)	2(1.29)	5:13	4.7
Level 40	1(0.86)	2(1.07)	2(1.23)	4:56	4.4
Level 45	1(0.83)	2(1.04)	2(1.18)	4:48	4.3
Level 50	1(0.82)	2(1.01)	2(1.14)	4:40	4.1

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)0.86

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)0.86
Blacephalon1.05
Darkrai1.07
Lunala1.16
Chandelure1.16
Kyurem (Black)1.15

A mixed local group

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

2 trainers at level 40

Zacian (Crowned Sword)1.20
Dragapult1.20
Hisuian Zoroark1.21
Hoopa1.21
Necrozma (Dusk Mane)1.22
Pheromosa1.22

The party these numbers assume

1. Necrozma (Dawn Wings)

Psycho Cut + Moongeist Beam

2. Blacephalon

Astonish + Shadow Ball

3. Darkrai

Snarl + Foul Play

4. Lunala

Shadow Claw + Shadow Ball

5. Chandelure

Hex + Shadow Ball

6. Kyurem (Black)

Shadow Claw + Freeze Shock

See the full ranked counter list for Hatenna · 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.