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 3 to be safe — 2 if everyone is prepared

At level 40, a party of Diancie's top six counters needs 1.73 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.54 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 7:59. No level in this range makes it soloable with a prepared party. A duo works from level 30.

Diancie · Tier 5

rockfairy

Weak to

steelgroundwatergrass

Boss CP: 43,487
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 Diancie 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(1.85)	3(2.47)	4(3.66)	11:23	5.9
Level 25	2(1.61)	3(2.12)	4(3.11)	9:46	5.8
Level 30	2(1.47)	2(1.87)	3(2.78)	8:37	5.7
Level 35	2(1.38)	2(1.79)	3(2.67)	8:14	5.6
Level 40	2(1.36)	2(1.73)	3(2.54)	7:59	5.5
Level 45	2(1.29)	2(1.64)	3(2.45)	7:34	5.3
Level 50	2(1.24)	2(1.61)	3(2.38)	7:23	5.0

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

Zacian (Crowned Sword)1.36

A prepared party

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

2 trainers at level 40

Zacian (Crowned Sword)1.36
Zamazenta (Crowned Shield)1.36
Necrozma (Dusk Mane)1.42
Metagross1.93
Lucario2.16
Dialga2.17

A mixed local group

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

3 trainers at level 40

Genesect (Douse)2.24
Genesect (Shock)2.24
Melmetal2.37
Kingambit2.48
Jirachi2.50
Duraludon2.59

The party these numbers assume

1. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

2. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

3. Necrozma (Dusk Mane)

Metal Claw + Sunsteel Strike

4. Metagross

Bullet Punch + Meteor Mash

5. Lucario

Bullet Punch + Meteor Mash

6. Dialga

Metal Claw + Iron Head

See the full ranked counter list for Diancie · 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.