Group size estimator
How many trainers do I need to invite?
Invite 4 to be safe — 3 if everyone is prepared
- Boss CP
- 42,539
- 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(3.59) | 5(4.28) | 6(5.72) | 20:12 | 6.0 |
| Level 25 | 4(3.24) | 4(3.75) | 5(4.97) | 17:43 | 6.0 |
| Level 30 | 3(2.92) | 4(3.17) | 5(4.38) | 14:58 | 5.9 |
| Level 35 | 3(2.84) | 3(2.93) | 5(4.06) | 13:51 | 5.9 |
| Level 40 | 3(2.55) | 3(2.76) | 4(3.81) | 13:03 | 5.9 |
| Level 45 | 3(2.50) | 3(2.67) | 4(3.66) | 12:38 | 5.9 |
| Level 50 | 3(2.44) | 3(2.58) | 4(3.55) | 12:12 | 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.
3 trainers at level 40
- Zamazenta (Crowned Shield)2.55
A prepared party
Each trainer brings the boss's top six counters, powered up and correctly TM'd.
3 trainers at level 40
- Zamazenta (Crowned Shield)2.55
- Zacian (Crowned Sword)2.57
- Eternatus2.65
- Necrozma (Dusk Mane)2.77
- Keldeo2.99
- Kyurem (Black)3.05
A mixed local group
Ranks 13-24: reasonable but unoptimised parties, which is what a public lobby usually is.
4 trainers at level 40
- Lucario3.53
- Dragapult3.72
- Regidrago3.71
- Garchomp3.74
- Rayquaza3.81
- Latios3.78
The party these numbers assume
See the full ranked counter list for Tyrantrum · 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.