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 Mega Latios's top six counters needs 1.30 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.71 (round up: 2). The raid timer is 300 seconds and one prepared trainer alone would take 6:01. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Mega Latios · Mega

dragonpsychic

Weak to

bugghosticedragondarkfairy

Boss CP: 53,126
Boss HP: 9,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Mega Latios 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(2.04)	3(2.22)	3(2.81)	10:19	6.0
Level 25	2(1.38)	2(1.69)	3(2.29)	7:52	6.0
Level 30	2(1.21)	2(1.47)	2(1.93)	6:50	6.0
Level 35	2(1.15)	2(1.37)	2(1.83)	6:21	6.0
Level 40	2(1.10)	2(1.30)	2(1.71)	6:01	6.0
Level 45	2(1.04)	2(1.24)	2(1.64)	5:46	6.0
Level 50	2(1.01)	2(1.21)	2(1.58)	5:36	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

Eternatus1.10

A prepared party

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

2 trainers at level 40

Eternatus1.10
Kyurem (Black)1.19
Kyurem (White)1.29
Necrozma (Dawn Wings)1.30
Baxcalibur1.43
Rayquaza1.47

A mixed local group

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

2 trainers at level 40

Lunala1.59
Regidrago1.63
Hydreigon1.67
Salamence1.68
Giratina (Origin)1.71
Kyurem1.75

The party these numbers assume

1. Eternatus

Dragon Tail + Dynamax Cannon

2. Kyurem (Black)

Dragon Tail + Freeze Shock

3. Kyurem (White)

Dragon Breath + Ice Burn

4. Necrozma (Dawn Wings)

Shadow Claw + Moongeist Beam

5. Baxcalibur

Dragon Breath + Glaive Rush

6. Rayquaza

Dragon Tail + Breaking Swipe

See the full ranked counter list for Mega Latios · 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.