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 Donphan's top six counters needs 1.40 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.65 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 4:05. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Donphan · Shadow Tier 3

ground

Weak to

watergrassice

Boss CP: 20,482
Boss HP: 4,000
Raid timer: 180s
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	2(1.77)	3(2.01)	3(2.51)	5:54	5.9
Level 25	2(1.48)	2(1.75)	3(2.13)	5:07	5.7
Level 30	2(1.30)	2(1.53)	2(1.90)	4:28	5.5
Level 35	2(1.26)	2(1.46)	2(1.73)	4:16	5.4
Level 40	2(1.18)	2(1.40)	2(1.65)	4:05	5.2
Level 45	2(1.14)	2(1.34)	2(1.59)	3:56	5.2
Level 50	2(1.11)	2(1.30)	2(1.53)	3:48	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

Kyurem (White)1.18

A prepared party

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

2 trainers at level 40

Kyurem (White)1.18
Kyurem (Black)1.33
Kartana1.42
Shaymin (Sky)1.45
Zarude1.50
Kyogre1.51

A mixed local group

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

2 trainers at level 40

Necrozma (Dusk Mane)1.55
Meowscarada1.61
Inteleon1.61
Greninja1.62
Swampert1.66
Roserade1.65

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Kartana

Razor Leaf + Leaf Blade

4. Shaymin (Sky)

Magical Leaf + Grass Knot

5. Zarude

Vine Whip + Power Whip

6. Kyogre

Waterfall + Origin Pulse

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.