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 6 to be safe — 4 if everyone is prepared

At level 40, a party of Mega Latias's top six counters needs 3.96 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 5.18 (round up: 6). The raid timer is 300 seconds and one prepared trainer alone would take 18:24. No level in this range makes it soloable with a prepared party.

Mega Latias · Mega Legendary

dragonpsychic

Weak to

bugghosticedragondarkfairy

Boss CP: 80,545
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 Latias 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	7(6.89)	7(6.99)	9(8.30)	32:30	6.0
Level 25	5(4.23)	6(5.30)	7(6.80)	24:37	6.0
Level 30	4(3.74)	5(4.51)	6(5.96)	20:57	6.0
Level 35	4(3.50)	5(4.15)	6(5.47)	19:16	6.0
Level 40	4(3.39)	4(3.96)	6(5.18)	18:24	6.0
Level 45	4(3.20)	4(3.81)	5(4.95)	17:42	6.0
Level 50	4(3.10)	4(3.70)	5(4.75)	17:13	5.9

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.

4 trainers at level 40

Eternatus3.39

A prepared party

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

4 trainers at level 40

Eternatus3.39
Kyurem (Black)3.60
Kyurem (White)3.85
Necrozma (Dawn Wings)3.81
Dialga (Origin)4.51
Palkia (Origin)4.58

A mixed local group

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

6 trainers at level 40

Hydreigon5.00
Lunala5.09
Reshiram5.12
Haxorus5.15
Palkia5.10
Giratina (Origin)5.19

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. Dialga (Origin)

Dragon Breath + Roar of Time

6. Palkia (Origin)

Dragon Tail + Spacial Rend

See the full ranked counter list for Mega Latias · 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.