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 Breloom's top six counters needs 1.01 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.30 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 4:40. A prepared solo becomes possible at level 45. A duo works from level 20.

Breloom · Tier 5

grassfighting

Weak to

flyingpoisonfirepsychicicefairy

Boss CP: 39,535
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 Breloom 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(1.22)	2(1.50)	2(1.93)	6:53	6.0
Level 25	2(1.07)	2(1.25)	2(1.61)	5:45	6.0
Level 30	1(0.94)	2(1.12)	2(1.44)	5:09	6.0
Level 35	1(0.88)	2(1.06)	2(1.37)	4:52	5.8
Level 40	1(0.87)	2(1.01)	2(1.30)	4:40	5.7
Level 45	1(0.83)	1(0.98)	2(1.25)	4:31	5.6
Level 50	1(0.81)	1(0.94)	2(1.21)	4:20	5.4

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

Rayquaza0.87

A prepared party

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

2 trainers at level 40

Rayquaza0.87
Yveltal1.01
Moltres1.02
Enamorus (Incarnate)1.02
Galarian Articuno1.07
Toucannon1.09

A mixed local group

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

2 trainers at level 40

Lugia1.25
Honchkrow1.24
Galarian Zapdos1.27
Galarian Moltres1.28
Tornadus (Incarnate)1.27
Flamigo1.28

The party these numbers assume

1. Rayquaza

Air Slash + Dragon Ascent

2. Yveltal

Gust + Oblivion Wing

3. Moltres

Wing Attack + Fly

4. Enamorus (Incarnate)

Fairy Wind + Fly

5. Galarian Articuno

Psycho Cut + Fly

6. Toucannon

Peck + Beak Blast

See the full ranked counter list for Breloom · 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.