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 Giratina (Origin)'s top six counters needs 1.22 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 1.54 (round up: 2). The raid timer is 180 seconds and one prepared trainer alone would take 3:35. No level in this range makes it soloable with a prepared party. A duo works from level 25.

Giratina (Origin) · Shadow Tier 3

ghostdragon

Weak to

ghosticedragondarkfairy

Boss CP: 21,573
Boss HP: 4,000
Raid timer: 180s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Giratina (Origin) 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(1.54)	3(2.06)	3(2.42)	6:01	6.0
Level 25	2(1.28)	2(1.63)	3(2.05)	4:46	6.0
Level 30	2(1.10)	2(1.35)	2(1.74)	3:57	6.0
Level 35	2(1.04)	2(1.28)	2(1.65)	3:44	6.0
Level 40	2(1.04)	2(1.22)	2(1.54)	3:35	6.0
Level 45	1(1.00)	2(1.17)	2(1.50)	3:26	5.9
Level 50	1(0.91)	2(1.14)	2(1.46)	3:20	5.8

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

Eternatus1.04

A prepared party

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

2 trainers at level 40

Eternatus1.04
Kyurem (Black)1.13
Kyurem (White)1.17
Baxcalibur1.30
Palkia (Origin)1.33
Rayquaza1.36

A mixed local group

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

2 trainers at level 40

Regidrago1.46
Darkrai1.47
Kyurem1.49
Salamence1.53
Palkia1.52
Hydreigon1.53

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. Baxcalibur

Dragon Breath + Glaive Rush

5. Palkia (Origin)

Dragon Breath + Spacial Rend

6. Rayquaza

Dragon Tail + Breaking Swipe

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