Group size estimator
How many trainers do I need to invite?
Invite 4 to be safe — 3 if everyone is prepared
- Boss CP
- 42,768
- Boss HP
- 15,000
- Raid timer
- 300s
- Party used
- 6
Trainers needed, by attacker level
Scroll sideways for the mixed-lobby column.
| Attacker level | Six of the best counter | A prepared party | A mixed local group | Prepared solo time | Faints per timer |
|---|---|---|---|---|---|
| Level 20 | 4(3.41) | 4(3.95) | 6(5.28) | 18:10 | 6.0 |
| Level 25 | 3(2.91) | 4(3.35) | 5(4.37) | 15:24 | 5.9 |
| Level 30 | 3(2.60) | 3(2.97) | 4(3.91) | 13:41 | 5.9 |
| Level 35 | 3(2.48) | 3(2.81) | 4(3.78) | 12:57 | 5.9 |
| Level 40 | 3(2.27) | 3(2.65) | 4(3.54) | 12:12 | 5.8 |
| Level 45 | 3(2.22) | 3(2.58) | 4(3.41) | 11:53 | 5.7 |
| Level 50 | 3(2.21) | 3(2.50) | 4(3.29) | 11:32 | 5.7 |
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
- Zacian (Crowned Sword)2.27
A prepared party
Each trainer brings the boss's top six counters, powered up and correctly TM'd.
3 trainers at level 40
- Zacian (Crowned Sword)2.27
- Zamazenta (Crowned Shield)2.37
- Necrozma (Dusk Mane)2.39
- Keldeo2.64
- Terrakion3.10
- Kartana3.14
A mixed local group
Ranks 13-24: reasonable but unoptimised parties, which is what a public lobby usually is.
4 trainers at level 40
- Dialga (Origin)3.43
- Shaymin (Sky)3.46
- Hisuian Decidueye3.48
- Inteleon3.50
- Zarude3.53
- Conkeldurr3.53
The party these numbers assume
See the full ranked counter list for Regirock · 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.