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 Keldeo's top six counters needs 1.97 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.23 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 9:04. No level in this range makes it soloable with a prepared party. A duo works from level 40.

Keldeo · Tier 5

waterfighting

Weak to

flyinggrasselectricpsychicfairy

Boss CP: 48,457
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 Keldeo 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(2.62)	4(3.12)	4(3.39)	14:21	6.0
Level 25	3(2.22)	3(2.58)	3(2.85)	11:52	6.0
Level 30	2(1.99)	3(2.22)	3(2.50)	10:13	6.0
Level 35	2(1.87)	3(2.07)	3(2.36)	9:31	6.0
Level 40	2(1.81)	2(1.97)	3(2.23)	9:04	6.0
Level 45	2(1.74)	2(1.91)	3(2.15)	8:47	6.0
Level 50	2(1.65)	2(1.84)	3(2.06)	8:27	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

Rayquaza1.81

A prepared party

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

2 trainers at level 40

Rayquaza1.81
Mewtwo1.88
Enamorus (Incarnate)1.93
Thundurus (Therian)2.05
Zeraora2.06
Tapu Lele2.08

A mixed local group

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

3 trainers at level 40

Hoopa (Unbound)2.10
Yveltal2.17
Shaymin (Sky)2.18
Eternatus2.19
Regieleki2.25
Salamence2.25

The party these numbers assume

1. Rayquaza

Air Slash + Dragon Ascent

2. Mewtwo

Confusion + Psystrike

3. Enamorus (Incarnate)

Fairy Wind + Fly

4. Thundurus (Therian)

Volt Switch + Wildbolt Storm

5. Zeraora

Volt Switch + Plasma Fists

6. Tapu Lele

Confusion + Nature's Madness

See the full ranked counter list for Keldeo · 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.