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 3.59 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.35 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 16:58. No level in this range makes it soloable with a prepared party.

Donphan · Shadow Tier 5

ground

Weak to

watergrassice

Boss CP: 39,663
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 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(4.78)	6(5.33)	7(6.79)	25:12	6.0
Level 25	4(3.90)	5(4.56)	6(5.62)	21:33	6.0
Level 30	4(3.41)	5(4.01)	5(4.85)	18:56	6.0
Level 35	4(3.27)	4(3.81)	5(4.55)	17:59	6.0
Level 40	4(3.09)	4(3.59)	5(4.35)	16:58	5.9
Level 45	3(2.98)	4(3.46)	5(4.16)	16:21	5.9
Level 50	3(2.87)	4(3.33)	4(4.00)	15:45	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.

4 trainers at level 40

Kyurem (White)3.09

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)3.09
Kyurem (Black)3.44
Shaymin (Sky)3.67
Zarude3.69
Kartana3.79
Zamazenta (Crowned Shield)3.87

A mixed local group

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

5 trainers at level 40

Samurott4.19
Meowscarada4.30
Chesnaught4.30
Decidueye4.33
Necrozma (Dawn Wings)4.33
Sceptile4.36

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. Zarude

Vine Whip + Power Whip

5. Kartana

Razor Leaf + Leaf Blade

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.