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 — 2 if everyone is prepared

At level 40, a party of Popplio's top six counters needs 1.09 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.36 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 5:02. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Popplio · Tier 5

water

Weak to

grasselectric

Boss CP: 17,960
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 Popplio 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(1.46)	2(1.54)	2(1.89)	7:05	5.9
Level 25	2(1.30)	2(1.35)	2(1.66)	6:12	5.7
Level 30	2(1.11)	2(1.20)	2(1.50)	5:32	5.4
Level 35	2(1.05)	2(1.15)	2(1.43)	5:17	5.3
Level 40	2(1.01)	2(1.09)	2(1.36)	5:02	5.1
Level 45	1(0.98)	2(1.06)	2(1.32)	4:53	4.9
Level 50	1(0.95)	2(1.02)	2(1.27)	4:43	4.5

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

Regieleki1.01

A prepared party

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

2 trainers at level 40

Regieleki1.01
Kartana1.09
Zeraora1.10
Thundurus (Therian)1.11
Xurkitree1.13
Zekrom1.14

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)1.31
Electivire1.31
Raikou1.32
Necrozma (Dawn Wings)1.35
Tapu Bulu1.36
Decidueye1.37

The party these numbers assume

1. Regieleki

Lock-On + Thunder Cage

2. Kartana

Razor Leaf + Leaf Blade

3. Zeraora

Volt Switch + Plasma Fists

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 Popplio · 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.