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 4 to be safe — 3 if everyone is prepared

At level 40, a party of Mega Drampa's top six counters needs 2.86 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.61 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 13:19. No level in this range makes it soloable with a prepared party.

Mega Drampa · Primal

normaldragon

Weak to

fightingicedragonfairy

Boss CP: 65,925
Boss HP: 22,500
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Mega Drampa 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(4.36)	6(5.03)	6(5.97)	23:22	6.0
Level 25	4(3.13)	4(3.97)	6(5.13)	18:28	6.0
Level 30	3(2.65)	4(3.27)	5(4.24)	15:11	6.0
Level 35	3(2.59)	4(3.01)	4(3.90)	13:59	6.0
Level 40	3(2.44)	3(2.86)	4(3.61)	13:19	6.0
Level 45	3(2.37)	3(2.75)	4(3.48)	12:48	6.0
Level 50	3(2.28)	3(2.67)	4(3.33)	12:23	6.0

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.

3 trainers at level 40

Eternatus2.44

A prepared party

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

3 trainers at level 40

Eternatus2.44
Kyurem (Black)2.64
Kyurem (White)2.82
Keldeo2.92
Baxcalibur3.17
Dialga (Origin)3.19

A mixed local group

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

4 trainers at level 40

Kartana3.45
Latios3.48
Blaziken3.54
Regidrago3.55
Dragapult3.56
Palkia3.57

The party these numbers assume

1. Eternatus

Dragon Tail + Dynamax Cannon

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Kyurem (White)

Dragon Breath + Ice Burn

4. Keldeo

Low Kick + Secret Sword

5. Baxcalibur

Ice Fang + Glaive Rush

6. Dialga (Origin)

Dragon Breath + Roar of Time

See the full ranked counter list for Mega Drampa · 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.