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 Treecko's top six counters needs 0.93 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 1.16 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 4:18. A prepared solo becomes possible at level 35. A duo works from level 20.

Treecko · Tier 5

grass

Weak to

flyingpoisonbugfireice

Boss CP: 17,773
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 Treecko 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(1.26)	2(1.30)	2(1.64)	6:00	5.6
Level 25	2(1.10)	2(1.14)	2(1.42)	5:14	5.2
Level 30	1(0.96)	2(1.02)	2(1.26)	4:41	4.2
Level 35	1(0.92)	1(0.97)	2(1.21)	4:29	4.0
Level 40	1(0.86)	1(0.93)	2(1.16)	4:18	3.5
Level 45	1(0.85)	1(0.91)	2(1.12)	4:11	3.2
Level 50	1(0.81)	1(0.88)	2(1.08)	4:03	2.9

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

Blacephalon0.86

A prepared party

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

1 trainer at level 40

Blacephalon0.86
Kyurem (White)0.89
Rayquaza0.93
Eternatus0.95
Kyurem (Black)0.98
Reshiram0.99

A mixed local group

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

2 trainers at level 40

Chandelure1.13
Cinderace1.15
Naganadel1.14
Heatran1.16
Pheromosa1.16
Darmanitan (Standard)1.16

The party these numbers assume

1. Blacephalon

Incinerate + Mind Blown

2. Kyurem (White)

Ice Fang + Ice Burn

3. Rayquaza

Air Slash + Dragon Ascent

4. Eternatus

Poison Jab + Dynamax Cannon

5. Kyurem (Black)

Dragon Tail + Freeze Shock

6. Reshiram

Fire Fang + Fusion Flare

See the full ranked counter list for Treecko · 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.