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 4 to be safe — 4 if everyone is prepared

At level 40, a party of Mega Staraptor's top six counters needs 3.15 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 3.61 (round up: 4). The raid timer is 300 seconds and one prepared trainer alone would take 14:38. No level in this range makes it soloable with a prepared party.

Mega Staraptor · Mega Legendary

fightingflying

Weak to

flyingelectricpsychicicefairy

Boss CP: 65,484
Boss HP: 22,500
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Mega Staraptor 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	6(5.54)	6(5.59)	6(5.85)	25:59	6.0
Level 25	5(4.20)	5(4.36)	5(4.69)	20:16	6.0
Level 30	4(3.21)	4(3.56)	5(4.05)	16:33	6.0
Level 35	4(3.03)	4(3.32)	4(3.84)	15:26	6.0
Level 40	3(2.93)	4(3.15)	4(3.61)	14:38	6.0
Level 45	3(2.81)	4(3.01)	4(3.46)	13:59	6.0
Level 50	3(2.74)	3(2.90)	4(3.34)	13:29	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.

3 trainers at level 40

Kyurem (White)2.93

A prepared party

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

4 trainers at level 40

Kyurem (White)2.93
Mewtwo3.00
Rayquaza3.03
Kyurem (Black)3.21
Regieleki3.32
Zeraora3.39

A mixed local group

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

4 trainers at level 40

Moltres3.48
Hoopa (Unbound)3.47
Zekrom3.51
Enamorus (Therian)3.50
Necrozma (Dawn Wings)3.54
Necrozma (Dusk Mane)3.60

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Mewtwo

Psycho Cut + Psystrike

3. Rayquaza

Air Slash + Dragon Ascent

4. Kyurem (Black)

Dragon Tail + Freeze Shock

5. Regieleki

Lock-On + Thunder Cage

6. Zeraora

Volt Switch + Plasma Fists

See the full ranked counter list for Mega Staraptor · 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.