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 5 to be safe — 4 if everyone is prepared

At level 40, a party of Mega Venusaur's top six counters needs 3.93 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.78 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 18:06. No level in this range makes it soloable with a prepared party.

Mega Venusaur · Super Mega

grasspoison

Weak to

flyingfirepsychicice

Boss CP: 65,392
Boss HP: 25,000
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	6(5.36)	7(6.11)	8(7.19)	28:08	6.0
Level 25	5(4.50)	6(5.15)	7(6.06)	23:42	6.0
Level 30	5(4.07)	5(4.47)	6(5.31)	20:35	6.0
Level 35	4(3.87)	5(4.13)	5(4.98)	19:00	6.0
Level 40	4(3.66)	4(3.93)	5(4.78)	18:06	6.0
Level 45	4(3.52)	4(3.77)	5(4.59)	17:20	6.0
Level 50	4(3.39)	4(3.62)	5(4.43)	16:40	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.

4 trainers at level 40

Kyurem (White)3.66

A prepared party

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

4 trainers at level 40

Kyurem (White)3.66
Rayquaza3.77
Blacephalon3.91
Mewtwo4.01
Kyurem (Black)4.01
Reshiram4.25

A mixed local group

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

5 trainers at level 40

Necrozma (Dawn Wings)4.67
Heatran4.66
Enamorus (Incarnate)4.75
Volcarona4.75
Zamazenta (Crowned Shield)4.77
Toucannon4.76

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.