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 5 to be safe — 4 if everyone is prepared

At level 40, a party of Giratina (Altered)'s top six counters needs 3.25 trainers (round up: 4), and a mixed lobby of ranks 13-24 needs 4.18 (round up: 5). The raid timer is 300 seconds and one prepared trainer alone would take 14:56. No level in this range makes it soloable with a prepared party.

Giratina (Altered) · Elite

ghostdragon

Weak to

ghosticedragondarkfairy

Boss CP: 44,255
Boss HP: 20,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Giratina (Altered) 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	5(4.02)	5(4.86)	7(6.37)	22:23	6.0
Level 25	4(3.39)	5(4.06)	6(5.29)	18:42	6.0
Level 30	4(3.03)	4(3.60)	5(4.69)	16:35	6.0
Level 35	3(2.95)	4(3.42)	5(4.42)	15:44	6.0
Level 40	3(2.73)	4(3.25)	5(4.18)	14:56	6.0
Level 45	3(2.67)	4(3.15)	5(4.07)	14:30	6.0
Level 50	3(2.64)	4(3.04)	4(3.94)	13:58	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

Eternatus2.73

A prepared party

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

4 trainers at level 40

Eternatus2.73
Kyurem (Black)3.07
Kyurem (White)3.28
Necrozma (Dawn Wings)3.20
Baxcalibur3.57
Palkia (Origin)3.63

A mixed local group

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

5 trainers at level 40

Dragapult4.04
Kyurem4.06
Darkrai4.06
Palkia4.06
Lunala4.16
Salamence4.21

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)

Psycho Cut + Moongeist Beam

5. Baxcalibur

Dragon Breath + Glaive Rush

6. Palkia (Origin)

Dragon Tail + Spacial Rend

See the full ranked counter list for Giratina (Altered) · 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.