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 Eelektross's top six counters needs 1.26 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.58 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 5:50. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Mega Eelektross · Mega

electric

Weak to

ground

Boss CP: 40,014
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 Eelektross 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(1.61)	2(1.78)	3(2.37)	8:16	5.8
Level 25	2(1.34)	2(1.55)	2(1.99)	7:12	5.6
Level 30	2(1.23)	2(1.37)	2(1.76)	6:22	5.5
Level 35	2(1.16)	2(1.31)	2(1.67)	6:07	5.4
Level 40	2(1.09)	2(1.26)	2(1.58)	5:50	5.4
Level 45	2(1.05)	2(1.23)	2(1.53)	5:42	5.3
Level 50	2(1.01)	2(1.17)	2(1.47)	5:27	5.3

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

Landorus (Therian)1.09

A prepared party

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

2 trainers at level 40

Landorus (Therian)1.09
Eternatus1.22
Groudon1.23
Garchomp1.34
Kyurem (Black)1.33
Mamoswine1.33

A mixed local group

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

2 trainers at level 40

Keldeo1.46
Krookodile1.51
Rhydon1.52
Golurk1.58
Ursaluna1.58
Baxcalibur1.60

The party these numbers assume

1. Landorus (Therian)

Mud Shot + Sandsear Storm

2. Eternatus

Poison Jab + Dynamax Cannon

3. Groudon

Mud Shot + Precipice Blades

4. Garchomp

Mud Shot + Earth Power

5. Kyurem (Black)

Dragon Tail + Freeze Shock

6. Mamoswine

Mud-Slap + High Horsepower

See the full ranked counter list for Mega Eelektross · 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.