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 Ralts's top six counters needs 1.00 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 1.37 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 4:36. A prepared solo becomes possible at level 40. A duo works from level 20.

Ralts · Elite

psychicfairy

Weak to

poisonghoststeel

Boss CP: 11,435
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 Ralts 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(1.17)	2(1.39)	2(1.91)	6:24	5.4
Level 25	2(1.02)	2(1.22)	2(1.67)	5:36	4.8
Level 30	1(0.92)	2(1.09)	2(1.50)	5:00	4.0
Level 35	1(0.90)	2(1.05)	2(1.43)	4:49	3.7
Level 40	1(0.86)	1(1.00)	2(1.37)	4:36	3.4
Level 45	1(0.83)	1(0.97)	2(1.33)	4:28	3.2
Level 50	1(0.80)	1(0.93)	2(1.29)	4:18	3.1

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

Zacian (Crowned Sword)0.86

A prepared party

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

1 trainer at level 40

Zacian (Crowned Sword)0.86
Necrozma (Dusk Mane)0.89
Zamazenta (Crowned Shield)0.89
Necrozma (Dawn Wings)0.96
Blacephalon1.19
Eternatus1.20

A mixed local group

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

2 trainers at level 40

Kyurem (Black)1.35
Tinkaton1.34
Dragapult1.35
Gholdengo1.36
Kyurem (White)1.36
Lucario1.36

The party these numbers assume

1. Zacian (Crowned Sword)

Metal Claw + Behemoth Blade

2. Necrozma (Dusk Mane)

Metal Claw + Sunsteel Strike

3. Zamazenta (Crowned Shield)

Metal Claw + Behemoth Bash

4. Necrozma (Dawn Wings)

Metal Claw + Moongeist Beam

5. Blacephalon

Astonish + Shadow Ball

6. Eternatus

Poison Jab + Sludge Bomb

See the full ranked counter list for Ralts · 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.