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 3 to be safe — 3 if everyone is prepared

At level 40, a party of Yanmega's top six counters needs 2.11 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.65 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 9:42. No level in this range makes it soloable with a prepared party. A duo works from level 50.

Yanmega · Elite

bugflying

Weak to

rockflyingfireelectricice

Boss CP: 45,493
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 Yanmega 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(3.14)	4(3.10)	5(4.03)	14:16	6.0
Level 25	3(2.66)	3(2.65)	4(3.42)	12:11	6.0
Level 30	3(2.25)	3(2.31)	3(2.95)	10:39	6.0
Level 35	3(2.15)	3(2.21)	3(2.77)	10:12	6.0
Level 40	2(1.97)	3(2.11)	3(2.65)	9:42	6.0
Level 45	2(1.90)	3(2.01)	3(2.55)	9:16	6.0
Level 50	2(1.82)	2(1.92)	3(2.46)	8:51	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.

2 trainers at level 40

Rampardos1.97

A prepared party

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

3 trainers at level 40

Rampardos1.97
Glimmora2.02
Rhyperior2.08
Terrakion2.16
Gigalith2.20
Tyrantrum2.22

A mixed local group

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

3 trainers at level 40

Lycanroc (Dusk)2.55
Lycanroc (Midday)2.55
Landorus (Incarnate)2.56
Stakataka2.58
Rayquaza2.59
Kyurem (Black)2.64

The party these numbers assume

1. Rampardos

Smack Down + Rock Slide

2. Glimmora

Rock Throw + Meteor Beam

3. Rhyperior

Smack Down + Rock Wrecker

4. Terrakion

Smack Down + Rock Slide

5. Gigalith

Lock-On + Meteor Beam

6. Tyrantrum

Rock Throw + Meteor Beam

See the full ranked counter list for Yanmega · 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.