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 — 3 if everyone is prepared

At level 40, a party of Seel's top six counters needs 2.12 trainers (round up: 3), and a mixed lobby of ranks 13-24 needs 2.64 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 9:45. No level in this range makes it soloable with a prepared party. A duo works from level 50.

Seel · Elite

water

Weak to

grasselectric

Boss CP: 16,492
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 Seel 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(2.81)	4(3.00)	4(3.71)	13:49	6.0
Level 25	3(2.38)	3(2.58)	4(3.21)	11:51	5.9
Level 30	3(2.14)	3(2.31)	3(2.88)	10:37	5.8
Level 35	3(2.04)	3(2.21)	3(2.75)	10:10	5.7
Level 40	2(1.94)	3(2.12)	3(2.64)	9:45	5.6
Level 45	2(1.89)	3(2.05)	3(2.54)	9:25	5.5
Level 50	2(1.82)	2(1.97)	3(2.46)	9:05	5.3

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

Regieleki1.94

A prepared party

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

3 trainers at level 40

Regieleki1.94
Zeraora2.11
Kartana2.14
Thundurus (Therian)2.11
Xurkitree2.16
Zekrom2.26

A mixed local group

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

3 trainers at level 40

Electivire2.55
Meowscarada2.56
Raikou2.56
Roserade2.57
Magnezone2.62
Zapdos2.62

The party these numbers assume

1. Regieleki

Lock-On + Thunder Cage

2. Zeraora

Volt Switch + Plasma Fists

3. Kartana

Razor Leaf + Leaf Blade

4. Thundurus (Therian)

Volt Switch + Wildbolt Storm

5. Xurkitree

Thunder Shock + Discharge

6. Zekrom

Charge Beam + Fusion Bolt

See the full ranked counter list for Seel · 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.