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 Magnezone's top six counters needs 2.65 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 3.53 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 12:11. No level in this range makes it soloable with a prepared party.

Magnezone · Elite

electricsteel

Weak to

groundfightingfire

Boss CP: 53,069
Boss HP: 20,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Magnezone 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	4(3.88)	5(4.01)	6(5.43)	18:28	6.0
Level 25	3(2.98)	4(3.34)	5(4.54)	15:22	6.0
Level 30	3(2.61)	4(3.03)	4(3.94)	13:57	5.9
Level 35	3(2.49)	3(2.88)	4(3.72)	13:16	5.9
Level 40	3(2.45)	3(2.65)	4(3.53)	12:11	5.9
Level 45	3(2.21)	3(2.54)	4(3.41)	11:42	5.8
Level 50	3(2.17)	3(2.47)	4(3.27)	11:22	5.8

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

Landorus (Therian)2.45

A prepared party

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

3 trainers at level 40

Landorus (Therian)2.45
Groudon2.46
Excadrill2.64
Garchomp2.64
Landorus (Incarnate)2.84
Mamoswine2.84

A mixed local group

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

4 trainers at level 40

Hippowdon3.38
Golem3.38
Flygon3.45
Torterra3.45
Reshiram3.43
Sandaconda3.49

The party these numbers assume

1. Landorus (Therian)

Mud Shot + Sandsear Storm

2. Groudon

Mud Shot + Precipice Blades

3. Excadrill

Mud-Slap + Scorching Sands

4. Garchomp

Mud Shot + Earth Power

5. Landorus (Incarnate)

Mud Shot + Earth Power

6. Mamoswine

Mud-Slap + High Horsepower

See the full ranked counter list for Magnezone · 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.