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 Shaymin (Land)'s top six counters needs 3.36 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.17 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 15:29. No level in this range makes it soloable with a prepared party.

Shaymin (Land) · Elite

grass

Weak to

flyingpoisonbugfireice

Boss CP: 47,729
Boss HP: 20,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Shaymin (Land) 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	5(4.50)	5(4.96)	7(6.27)	22:50	6.0
Level 25	4(3.85)	5(4.22)	6(5.30)	19:26	6.0
Level 30	4(3.46)	4(3.75)	5(4.59)	17:14	6.0
Level 35	4(3.35)	4(3.58)	5(4.39)	16:30	6.0
Level 40	4(3.13)	4(3.36)	5(4.17)	15:29	6.0
Level 45	4(3.02)	4(3.20)	5(4.03)	14:44	5.9
Level 50	3(2.89)	4(3.09)	4(3.90)	14:13	5.8

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)3.13

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)3.13
Rayquaza3.21
Eternatus3.24
Kyurem (Black)3.49
Blacephalon3.56
Reshiram3.56

A mixed local group

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

5 trainers at level 40

Volcarona4.05
Naganadel4.08
Galarian Articuno4.06
Zamazenta (Crowned Shield)4.06
Cinderace4.15
Ho-Oh4.16

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Rayquaza

Air Slash + Dragon Ascent

3. Eternatus

Poison Jab + Dynamax Cannon

4. Kyurem (Black)

Dragon Tail + Freeze Shock

5. Blacephalon

Incinerate + Mind Blown

6. Reshiram

Fire Fang + Fusion Flare

See the full ranked counter list for Shaymin (Land) · 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.