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 Kartana's top six counters needs 2.24 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 10:19. No level in this range makes it soloable with a prepared party.

Kartana · Elite

grasssteel

Weak to

firefighting

Boss CP: 67,091
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 Kartana 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	3(2.93)	4(3.42)	5(4.15)	15:45	6.0
Level 25	3(2.50)	3(2.91)	4(3.45)	13:24	6.0
Level 30	3(2.20)	3(2.50)	3(3.00)	11:29	6.0
Level 35	3(2.12)	3(2.38)	3(2.80)	10:56	6.0
Level 40	2(2.00)	3(2.24)	3(2.65)	10:19	5.9
Level 45	2(1.88)	3(2.14)	3(2.55)	9:50	5.9
Level 50	2(1.80)	3(2.04)	3(2.44)	9:23	5.9

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.

2 trainers at level 40

Reshiram2.00

A prepared party

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

3 trainers at level 40

Reshiram2.00
Blacephalon2.13
Heatran2.23
Cinderace2.32
Ho-Oh2.33
Moltres2.44

A mixed local group

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

3 trainers at level 40

Delphox2.55
Entei2.55
Victini2.56
Infernape2.66
Typhlosion2.66
Flareon2.66

The party these numbers assume

1. Reshiram

Fire Fang + Fusion Flare

2. Blacephalon

Incinerate + Mind Blown

3. Heatran

Fire Spin + Magma Storm

4. Cinderace

Fire Spin + Pyroball

5. Ho-Oh

Incinerate + Sacred Fire++

6. Moltres

Fire Spin + Overheat

See the full ranked counter list for Kartana · 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.