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 Landorus (Therian)'s top six counters needs 1.05 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.43 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 3:05. A prepared solo becomes possible at level 50. A duo works from level 20.

Landorus (Therian) · Shadow Tier 3

groundflying

Weak to

icewater

Boss CP: 26,779
Boss HP: 4,000
Raid timer: 180s
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(1.36)	2(1.91)	3(2.21)	5:36	6.0
Level 25	2(1.04)	2(1.49)	2(1.88)	4:22	6.0
Level 30	1(0.83)	2(1.24)	2(1.60)	3:38	6.0
Level 35	1(0.78)	2(1.14)	2(1.51)	3:20	5.9
Level 40	1(0.72)	2(1.05)	2(1.43)	3:05	5.8
Level 45	1(0.72)	2(1.01)	2(1.35)	2:57	5.7
Level 50	1(0.69)	1(0.97)	2(1.28)	2:50	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.

1 trainer at level 40

Kyurem (White)0.72

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)0.72
Kyurem (Black)0.93
Baxcalibur1.08
Mamoswine1.16
Cetitan1.18
Mewtwo1.26

A mixed local group

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

2 trainers at level 40

Avalugg1.36
Cryogonal1.39
Articuno1.39
Weavile1.41
Mr. Rime1.41
Aurorus1.43

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. Cetitan

Ice Shard + Avalanche

6. Mewtwo

Psycho Cut + Ice Beam

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.