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 1 to be safe — 1 if everyone is prepared

At level 40, a party of Deoxys (Attack)'s top six counters needs 0.69 trainers (round up: 1), and a mixed lobby of ranks 13-24 needs 0.80 (round up: 1). The raid timer is 300 seconds and one prepared trainer alone would take 3:11. A prepared solo becomes possible at level 25. A duo works from level 20.

Deoxys (Attack) · Tier 5

psychic

Weak to

bugghostdark

Boss CP: 41,036
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 Deoxys (Attack) 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(1.08)	2(1.11)	2(1.27)	5:07	6.0
Level 25	1(0.95)	1(0.93)	2(1.08)	4:16	6.0
Level 30	1(0.74)	1(0.77)	1(0.92)	3:32	5.8
Level 35	1(0.71)	1(0.73)	1(0.85)	3:22	5.6
Level 40	1(0.67)	1(0.69)	1(0.80)	3:11	5.4
Level 45	1(0.66)	1(0.65)	1(0.76)	3:00	5.4
Level 50	1(0.64)	1(0.61)	1(0.72)	2:49	5.3

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

Tyranitar0.67

A prepared party

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

1 trainer at level 40

Tyranitar0.67
Necrozma (Dawn Wings)0.66
Hydreigon0.68
Darkrai0.69
Kyurem (Black)0.71
Eternatus0.72

A mixed local group

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

1 trainer at level 40

Incineroar0.76
Zacian (Crowned Sword)0.77
Guzzlord0.77
Kartana0.77
Lunala0.76
Absol0.83

The party these numbers assume

1. Tyranitar

Bite + Brutal Swing

2. Necrozma (Dawn Wings)

Shadow Claw + Moongeist Beam

3. Hydreigon

Bite + Brutal Swing

4. Darkrai

Snarl + Foul Play

5. Kyurem (Black)

Shadow Claw + Freeze Shock

6. Eternatus

Poison Jab + Dynamax Cannon

See the full ranked counter list for Deoxys (Attack) · 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.