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 Skiploom's top six counters needs 0.93 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 1.23 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 4:16. A prepared solo becomes possible at level 35. A duo works from level 20.

Skiploom · Tier 5

grassflying

Weak to

iceflyingpoisonrockfire

Boss CP: 15,084
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 Skiploom 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	1(0.96)	2(1.32)	2(1.71)	6:04	5.8
Level 25	1(0.84)	2(1.14)	2(1.49)	5:14	5.5
Level 30	1(0.77)	2(1.02)	2(1.34)	4:42	5.1
Level 35	1(0.72)	1(0.97)	2(1.29)	4:27	4.9
Level 40	1(0.70)	1(0.93)	2(1.23)	4:16	4.7
Level 45	1(0.68)	1(0.90)	2(1.19)	4:10	4.4
Level 50	1(0.65)	1(0.87)	2(1.15)	4:00	4.1

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

Kyurem (White)0.70

A prepared party

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

1 trainer at level 40

Kyurem (White)0.70
Kyurem (Black)0.89
Galarian Darmanitan (Standard)0.96
Baxcalibur0.97
Mamoswine1.01
Blacephalon1.05

A mixed local group

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

2 trainers at level 40

Eternatus1.18
Mewtwo1.18
Mr. Rime1.20
Frosmoth1.21
Avalugg1.23
Aurorus1.23

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Galarian Darmanitan (Standard)

Ice Fang + Avalanche

4. Baxcalibur

Ice Fang + Avalanche

5. Mamoswine

Powder Snow + Avalanche

6. Blacephalon

Incinerate + Mind Blown

See the full ranked counter list for Skiploom · 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.