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 Leavanny's top six counters needs 1.04 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.27 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 4:46. A prepared solo becomes possible at level 50. A duo works from level 20.

Leavanny · Tier 5

buggrass

Weak to

flyingfirepoisonrockbugice

Boss CP: 36,149
Boss HP: 15,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Leavanny 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(1.55)	2(1.50)	2(1.80)	6:54	6.0
Level 25	2(1.17)	2(1.28)	2(1.57)	5:54	5.9
Level 30	2(1.04)	2(1.14)	2(1.39)	5:16	5.7
Level 35	1(0.98)	2(1.09)	2(1.32)	5:01	5.4
Level 40	1(0.92)	2(1.04)	2(1.27)	4:46	5.1
Level 45	1(0.90)	2(1.01)	2(1.22)	4:38	4.8
Level 50	1(0.86)	1(0.97)	2(1.18)	4:29	4.6

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

Blacephalon0.92

A prepared party

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

2 trainers at level 40

Blacephalon0.92
Rayquaza0.95
Reshiram1.03
Salamence1.07
Moltres1.10
Yveltal1.15

A mixed local group

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

2 trainers at level 40

Blaziken1.21
Chandelure1.20
Enamorus (Incarnate)1.23
Darmanitan (Standard)1.23
Tornadus (Therian)1.27
Emboar1.27

The party these numbers assume

1. Blacephalon

Incinerate + Mind Blown

2. Rayquaza

Air Slash + Dragon Ascent

3. Reshiram

Fire Fang + Fusion Flare

4. Salamence

Fire Fang + Fly

5. Moltres

Fire Spin + Fly

6. Yveltal

Gust + Oblivion Wing

See the full ranked counter list for Leavanny · 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.