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 5 to be safe — 4 if everyone is prepared

At level 40, a party of Donphan's top six counters needs 3.43 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.11 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 15:46. No level in this range makes it soloable with a prepared party.

Donphan · Elite

ground

Weak to

watergrassice

Boss CP: 45,800
Boss HP: 20,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Donphan 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	5(4.61)	6(5.32)	7(6.52)	24:29	6.0
Level 25	4(3.65)	5(4.29)	6(5.43)	19:45	6.0
Level 30	4(3.21)	4(3.74)	5(4.69)	17:12	6.0
Level 35	4(3.02)	4(3.59)	5(4.43)	16:32	6.0
Level 40	3(2.90)	4(3.43)	5(4.11)	15:46	6.0
Level 45	3(2.78)	4(3.27)	4(3.96)	15:04	5.9
Level 50	3(2.71)	4(3.16)	4(3.81)	14:33	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.

3 trainers at level 40

Kyurem (White)2.90

A prepared party

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

4 trainers at level 40

Kyurem (White)2.90
Kyurem (Black)3.30
Shaymin (Sky)3.45
Kartana3.64
Kyogre3.58
Zamazenta (Crowned Shield)3.70

A mixed local group

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

5 trainers at level 40

Meowscarada4.00
Zacian (Crowned Sword)3.90
Necrozma (Dawn Wings)4.07
Tapu Bulu4.08
Baxcalibur4.14
Tangrowth4.10

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Shaymin (Sky)

Magical Leaf + Grass Knot

4. Kartana

Razor Leaf + Leaf Blade

5. Kyogre

Waterfall + Origin Pulse

6. Zamazenta (Crowned Shield)

Ice Fang + Behemoth Bash

See the full ranked counter list for Donphan · 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.