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 Paras's top six counters needs 1.09 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.32 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 5:00. No level in this range makes it soloable with a prepared party. A duo works from level 20.

Paras · Elite

buggrass

Weak to

flyingfirepoisonrockbugice

Boss CP: 20,535
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 Paras 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(1.33)	2(1.51)	2(1.84)	6:56	5.9
Level 25	2(1.14)	2(1.32)	2(1.60)	6:05	5.5
Level 30	2(1.00)	2(1.19)	2(1.44)	5:27	5.0
Level 35	1(0.95)	2(1.13)	2(1.38)	5:13	4.8
Level 40	1(0.92)	2(1.09)	2(1.32)	5:00	4.3
Level 45	1(0.89)	2(1.05)	2(1.27)	4:49	4.0
Level 50	1(0.86)	2(1.01)	2(1.23)	4:39	3.8

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

Blacephalon0.92

A prepared party

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

2 trainers at level 40

Blacephalon0.92
Rayquaza1.00
Reshiram1.09
Salamence1.13
Moltres1.16
Yveltal1.20

A mixed local group

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

2 trainers at level 40

Darmanitan (Standard)1.27
Blaziken1.26
Enamorus (Incarnate)1.27
Ho-Oh1.30
Tornadus (Therian)1.31
Delphox1.33

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. Yveltal

Gust + Oblivion Wing

See the full ranked counter list for Paras · 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.