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 3 to be safe — 2 if everyone is prepared

At level 40, a party of Terrakion's top six counters needs 1.74 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.29 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 8:00. No level in this range makes it soloable with a prepared party. A duo works from level 30.

Terrakion · Tier 5

rockfighting

Weak to

fightinggroundsteelwatergrasspsychic

Boss CP: 48,457
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 Terrakion 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	3(2.54)	3(2.85)	4(3.52)	13:06	6.0
Level 25	3(2.24)	3(2.33)	3(2.93)	10:44	6.0
Level 30	2(1.82)	2(1.96)	3(2.56)	9:00	5.9
Level 35	2(1.66)	2(1.81)	3(2.40)	8:20	5.9
Level 40	2(1.55)	2(1.74)	3(2.29)	8:00	5.9
Level 45	2(1.54)	2(1.68)	3(2.21)	7:45	5.9
Level 50	2(1.49)	2(1.62)	3(2.13)	7:28	5.9

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

Necrozma (Dusk Mane)1.55

A prepared party

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

2 trainers at level 40

Necrozma (Dusk Mane)1.55
Zamazenta (Crowned Shield)1.56
Zacian (Crowned Sword)1.63
Keldeo1.75
Mewtwo1.92
Terrakion2.02

A mixed local group

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

3 trainers at level 40

Zarude2.23
Latios2.26
Kartana2.26
Inteleon2.26
Lunala2.28
Kyogre2.27

The party these numbers assume

1. Necrozma (Dusk Mane)

Psycho Cut + Sunsteel Strike

2. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

3. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

4. Keldeo

Low Kick + Secret Sword

5. Mewtwo

Confusion + Psystrike

6. Terrakion

Double Kick + Sacred Sword

See the full ranked counter list for Terrakion · 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.