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 — 2 if everyone is prepared

At level 40, a party of Sandslash's top six counters needs 1.86 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.26 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 8:34. No level in this range makes it soloable with a prepared party. A duo works from level 35.

Sandslash · Tier 5

ground

Weak to

watergrassice

Boss CP: 33,257
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 Sandslash 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(2.29)	3(2.75)	4(3.42)	12:40	5.9
Level 25	3(2.01)	3(2.43)	3(2.81)	11:10	5.8
Level 30	2(1.75)	3(2.06)	3(2.48)	9:29	5.7
Level 35	2(1.67)	2(1.96)	3(2.34)	9:00	5.7
Level 40	2(1.61)	2(1.86)	3(2.26)	8:34	5.7
Level 45	2(1.56)	2(1.80)	3(2.18)	8:17	5.6
Level 50	2(1.48)	2(1.74)	3(2.12)	8:01	5.6

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

Kyurem (White)1.61

A prepared party

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

2 trainers at level 40

Kyurem (White)1.61
Kyurem (Black)1.77
Kartana1.86
Shaymin (Sky)1.94
Inteleon1.95
Kyogre2.04

A mixed local group

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

3 trainers at level 40

Greninja2.20
Kingler2.22
Galarian Darmanitan (Standard)2.23
Tapu Bulu2.24
Necrozma (Dawn Wings)2.24
Roserade2.26

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Kartana

Razor Leaf + Leaf Blade

4. Shaymin (Sky)

Magical Leaf + Grass Knot

5. Inteleon

Water Gun + Hydro Cannon

6. Kyogre

Waterfall + Origin Pulse

See the full ranked counter list for Sandslash · 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.