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 Rellor's top six counters needs 1.89 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.22 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 8:42. No level in this range makes it soloable with a prepared party. A duo works from level 35.

Rellor · Elite

bug

Weak to

flyingrockfire

Boss CP: 15,841
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 Rellor 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(2.35)	3(2.59)	4(3.05)	11:54	5.3
Level 25	3(2.06)	3(2.29)	3(2.70)	10:33	4.7
Level 30	2(1.83)	3(2.05)	3(2.43)	9:27	4.2
Level 35	2(1.77)	2(1.97)	3(2.33)	9:03	3.8
Level 40	2(1.69)	2(1.89)	3(2.22)	8:42	3.7
Level 45	2(1.55)	2(1.81)	3(2.14)	8:19	3.5
Level 50	2(1.51)	2(1.74)	3(2.08)	8:01	3.3

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

Blacephalon1.69

A prepared party

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

2 trainers at level 40

Blacephalon1.69
Rayquaza1.72
Reshiram1.91
Salamence1.97
Moltres2.01
Enamorus (Incarnate)2.04

A mixed local group

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

3 trainers at level 40

Galarian Articuno2.17
Rampardos2.18
Heatran2.20
Darmanitan (Standard)2.20
Blaziken2.20
Tornadus (Therian)2.21

The party these numbers assume

1. Blacephalon

Incinerate + Mind Blown

2. Rayquaza

Air Slash + Dragon Ascent

3. Reshiram

Fire Fang + Fusion Flare

4. Salamence

Fire Fang + Fly

5. Moltres

Fire Spin + Fly

6. Enamorus (Incarnate)

Fairy Wind + Fly

See the full ranked counter list for Rellor · 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.