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 Mega Delphox's top six counters needs 1.53 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.77 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 7:07. No level in this range makes it soloable with a prepared party. A duo works from level 30.

Mega Delphox · Mega

firepsychic

Weak to

groundrockghostwaterdark

Boss CP: 51,899
Boss HP: 9,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Mega Delphox 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	3(2.08)	3(2.41)	3(2.73)	11:12	6.0
Level 25	2(1.80)	3(2.00)	3(2.29)	9:19	6.0
Level 30	2(1.39)	2(1.77)	2(1.96)	8:14	6.0
Level 35	2(1.33)	2(1.63)	2(1.85)	7:34	6.0
Level 40	2(1.28)	2(1.53)	2(1.77)	7:07	6.0
Level 45	2(1.26)	2(1.49)	2(1.70)	6:55	6.0
Level 50	2(1.16)	2(1.44)	2(1.65)	6:43	5.9

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

Necrozma (Dawn Wings)1.28

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)1.28
Inteleon1.55
Tyranitar1.58
Lunala1.59
Landorus (Therian)1.59
Hydreigon1.60

A mixed local group

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

2 trainers at level 40

Giratina (Origin)1.72
Rhyperior1.71
Dragapult1.75
Primarina1.75
Crawdaunt1.73
Garchomp1.77

The party these numbers assume

1. Necrozma (Dawn Wings)

Shadow Claw + Moongeist Beam

2. Inteleon

Water Gun + Hydro Cannon

3. Tyranitar

Bite + Brutal Swing

4. Lunala

Shadow Claw + Shadow Ball

5. Landorus (Therian)

Mud Shot + Sandsear Storm

6. Hydreigon

Bite + Brutal Swing

See the full ranked counter list for Mega Delphox · 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.