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 — 1 if everyone is prepared

At level 40, a party of Groudon's top six counters needs 0.86 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 1.05 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 2:32. A prepared solo becomes possible at level 30. A duo works from level 20.

Groudon · Tier 3

ground

Weak to

watergrassice

Boss CP: 26,656
Boss HP: 3,600
Raid timer: 180s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Groudon 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(1.07)	2(1.26)	2(1.56)	3:40	5.8
Level 25	1(0.87)	2(1.09)	2(1.37)	3:11	5.7
Level 30	1(0.79)	1(0.97)	2(1.18)	2:50	5.2
Level 35	1(0.74)	1(0.90)	2(1.11)	2:39	4.8
Level 40	1(0.71)	1(0.86)	2(1.05)	2:32	4.6
Level 45	1(0.68)	1(0.84)	2(1.01)	2:27	4.3
Level 50	1(0.66)	1(0.80)	1(0.99)	2:20	4.1

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

Kyurem (White)0.71

A prepared party

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

1 trainer at level 40

Kyurem (White)0.71
Kyurem (Black)0.79
Shaymin (Sky)0.89
Rillaboom0.91
Zarude0.93
Kartana0.95

A mixed local group

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

2 trainers at level 40

Zacian (Crowned Sword)1.03
Chesnaught1.05
Necrozma (Dawn Wings)1.05
Meowscarada1.07
Kyurem1.05
Primarina1.04

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Shaymin (Sky)

Magical Leaf + Grass Knot

4. Rillaboom

Razor Leaf + Frenzy Plant

5. Zarude

Vine Whip + Power Whip

6. Kartana

Razor Leaf + Leaf Blade

See the full ranked counter list for Groudon · 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.