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 Mega Venusaur's top six counters needs 1.38 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.69 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 6:25. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Mega Venusaur · Mega

grasspoison

Weak to

flyingfirepsychicice

Boss CP: 39,235
Boss HP: 9,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Mega Venusaur 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(1.88)	3(2.10)	3(2.47)	9:47	6.0
Level 25	2(1.59)	2(1.78)	3(2.12)	8:17	6.0
Level 30	2(1.44)	2(1.56)	2(1.87)	7:15	6.0
Level 35	2(1.38)	2(1.45)	2(1.76)	6:44	5.9
Level 40	2(1.29)	2(1.38)	2(1.69)	6:25	5.9
Level 45	2(1.24)	2(1.33)	2(1.61)	6:11	5.9
Level 50	2(1.20)	2(1.28)	2(1.57)	5:57	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

Kyurem (White)1.29

A prepared party

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

2 trainers at level 40

Kyurem (White)1.29
Rayquaza1.32
Blacephalon1.35
Mewtwo1.41
Kyurem (Black)1.41
Reshiram1.50

A mixed local group

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

2 trainers at level 40

Necrozma (Dawn Wings)1.60
Heatran1.65
Enamorus (Incarnate)1.68
Cinderace1.68
Zamazenta (Crowned Shield)1.69
Volcarona1.68

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Rayquaza

Air Slash + Dragon Ascent

3. Blacephalon

Incinerate + Mind Blown

4. Mewtwo

Confusion + Psystrike

5. Kyurem (Black)

Dragon Tail + Freeze Shock

6. Reshiram

Fire Fang + Fusion Flare

See the full ranked counter list for Mega Venusaur · 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.