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 1 to be safe — 1 if everyone is prepared

At level 40, a party of Trapinch's top six counters needs 0.64 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 0.76 (round up: 1). The raid timer is 180 seconds and one prepared trainer alone would take 1:52. A prepared solo becomes possible at level 20. A duo works from level 20.

Trapinch · Shadow Tier 3

ground

Weak to

watergrassice

Boss CP: 10,795
Boss HP: 4,000
Raid timer: 180s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Trapinch 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	1(0.76)	1(0.91)	2(1.11)	2:40	5.2
Level 25	1(0.65)	1(0.77)	1(0.96)	2:15	4.4
Level 30	1(0.59)	1(0.70)	1(0.84)	2:03	3.6
Level 35	1(0.56)	1(0.66)	1(0.80)	1:56	3.2
Level 40	1(0.55)	1(0.64)	1(0.76)	1:52	2.9
Level 45	1(0.51)	1(0.61)	1(0.73)	1:47	2.5
Level 50	1(0.51)	1(0.58)	1(0.71)	1:43	2.1

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)0.55

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)0.55
Kyurem (Black)0.61
Kartana0.62
Shaymin (Sky)0.67
Inteleon0.69
Kyogre0.69

A mixed local group

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

1 trainer at level 40

Eternatus0.73
Roserade0.74
Primarina0.75
Baxcalibur0.74
Kingler0.76
Sceptile0.76

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Kartana

Razor Leaf + Leaf Blade

4. Shaymin (Sky)

Magical Leaf + Grass Knot

5. Inteleon

Water Gun + Hydro Cannon

6. Kyogre

Waterfall + Origin Pulse

See the full ranked counter list for Trapinch · 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.