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 Ivysaur's top six counters needs 1.40 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.70 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 6:27. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Ivysaur · Tier 5

grasspoison

Weak to

flyingfirepsychicice

Boss CP: 25,555
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 Ivysaur 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(1.86)	3(2.03)	3(2.41)	9:21	6.0
Level 25	2(1.59)	2(1.71)	3(2.09)	7:52	6.0
Level 30	2(1.45)	2(1.53)	2(1.88)	7:01	5.9
Level 35	2(1.37)	2(1.45)	2(1.78)	6:41	5.8
Level 40	2(1.32)	2(1.40)	2(1.70)	6:27	5.7
Level 45	2(1.29)	2(1.35)	2(1.64)	6:13	5.6
Level 50	2(1.22)	2(1.29)	2(1.58)	5:56	5.5

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)1.32

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)1.32
Blacephalon1.34
Rayquaza1.37
Kyurem (Black)1.45
Mewtwo1.45
Reshiram1.49

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)1.63
Toucannon1.66
Heatran1.66
Volcarona1.70
Zacian (Crowned Sword)1.71
Zamazenta (Crowned Shield)1.71

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Blacephalon

Incinerate + Mind Blown

3. Rayquaza

Air Slash + Dragon Ascent

4. Kyurem (Black)

Dragon Tail + Freeze Shock

5. Mewtwo

Confusion + Psystrike

6. Reshiram

Fire Fang + Fusion Flare

See the full ranked counter list for Ivysaur · 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.