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 1 to be safe — 1 if everyone is prepared

At level 40, a party of Metagross's top six counters needs 0.81 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 0.97 (round up: 1). The raid timer is 180 seconds and one prepared trainer alone would take 2:23. A prepared solo becomes possible at level 30. A duo works from level 20.

Metagross · Tier 3

steelpsychic

Weak to

groundghostfiredark

Boss CP: 25,440
Boss HP: 3,600
Raid timer: 180s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Metagross 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(1.01)	2(1.22)	2(1.42)	3:33	6.0
Level 25	1(0.87)	2(1.05)	2(1.21)	3:05	5.7
Level 30	1(0.79)	1(0.90)	2(1.08)	2:39	5.1
Level 35	1(0.72)	1(0.86)	2(1.02)	2:31	4.8
Level 40	1(0.69)	1(0.81)	1(0.97)	2:23	4.5
Level 45	1(0.66)	1(0.77)	1(0.94)	2:16	4.1
Level 50	1(0.66)	1(0.75)	1(0.90)	2:12	3.9

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.

1 trainer at level 40

Necrozma (Dawn Wings)0.69

A prepared party

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

1 trainer at level 40

Necrozma (Dawn Wings)0.69
Blacephalon0.78
Reshiram0.81
Landorus (Therian)0.81
Darkrai0.87
Lunala0.91

A mixed local group

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

1 trainer at level 40

Moltres0.95
Ho-Oh0.96
Chandelure0.94
Heatran0.95
Dragapult0.98
Hoopa (Unbound)0.98

The party these numbers assume

1. Necrozma (Dawn Wings)

Shadow Claw + Moongeist Beam

2. Blacephalon

Astonish + Mind Blown

3. Reshiram

Fire Fang + Fusion Flare

4. Landorus (Therian)

Mud Shot + Sandsear Storm

5. Darkrai

Snarl + Foul Play

6. Lunala

Shadow Claw + Shadow Ball

See the full ranked counter list for Metagross · 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.