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 Shuckle's top six counters needs 3.41 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.49 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 15:41. No level in this range makes it soloable with a prepared party.

Shuckle · Tier 5

bugrock

Weak to

rocksteelwater

Boss CP: 7,945
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 Shuckle 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	4(3.63)	5(4.55)	6(5.87)	20:56	2.0
Level 25	4(3.38)	5(4.08)	6(5.27)	18:46	1.6
Level 30	4(3.17)	4(3.75)	5(4.87)	17:16	1.2
Level 35	4(3.09)	4(3.53)	5(4.58)	16:16	1.1
Level 40	3(2.78)	4(3.41)	5(4.49)	15:41	1.1
Level 45	3(2.73)	4(3.31)	5(4.23)	15:14	1.0
Level 50	3(2.68)	4(3.25)	5(4.16)	14:58	1.0

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.

3 trainers at level 40

Necrozma (Dusk Mane)2.78

A prepared party

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

4 trainers at level 40

Necrozma (Dusk Mane)2.78
Zacian (Crowned Sword)2.83
Zamazenta (Crowned Shield)2.98
Inteleon3.86
Metagross4.00
Necrozma (Dawn Wings)4.01

A mixed local group

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

5 trainers at level 40

Glimmora4.32
Empoleon4.32
Gigalith4.41
Kingler4.47
Tyrantrum4.47
Dialga (Origin)4.48

The party these numbers assume

1. Necrozma (Dusk Mane)

Metal Claw + Sunsteel Strike

2. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

3. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

4. Inteleon

Water Gun + Hydro Cannon

5. Metagross

Bullet Punch + Meteor Mash

6. Necrozma (Dawn Wings)

Metal Claw + Moongeist Beam

See the full ranked counter list for Shuckle · 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.