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 Landorus (Therian)'s top six counters needs 1.50 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.01 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 6:54. No level in this range makes it soloable with a prepared party. A duo works from level 30.

Landorus (Therian) · Tier 5

groundflying

Weak to

icewater

Boss CP: 51,858
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 Landorus (Therian) 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(1.82)	3(2.77)	4(3.46)	12:46	6.0
Level 25	2(1.38)	3(2.10)	3(2.81)	9:41	6.0
Level 30	2(1.18)	2(1.71)	3(2.35)	7:52	6.0
Level 35	2(1.13)	2(1.57)	3(2.17)	7:14	6.0
Level 40	2(1.10)	2(1.50)	3(2.01)	6:54	6.0
Level 45	2(1.06)	2(1.46)	2(1.92)	6:42	6.0
Level 50	1(1.00)	2(1.38)	2(1.84)	6:22	6.0

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)1.10

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)1.10
Kyurem (Black)1.41
Baxcalibur1.50
Mamoswine1.58
Glaceon1.65
Cetitan1.76

A mixed local group

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

3 trainers at level 40

Galarian Darmanitan (Standard)1.89
Weavile1.91
Zamazenta (Crowned Shield)1.96
Abomasnow1.97
Kyurem1.93
Beartic1.98

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Baxcalibur

Ice Fang + Avalanche

4. Mamoswine

Powder Snow + Avalanche

5. Glaceon

Frost Breath + Avalanche

6. Cetitan

Ice Shard + Avalanche

See the full ranked counter list for Landorus (Therian) · 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.