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 3 to be safe — 2 if everyone is prepared

At level 40, a party of Roserade's top six counters needs 1.84 trainers (round up: 2), and a mixed lobby of ranks 13-24 needs 2.21 (round up: 3). The raid timer is 300 seconds and one prepared trainer alone would take 8:27. No level in this range makes it soloable with a prepared party. A duo works from level 35.

Roserade · Tier 5

grasspoison

Weak to

flyingfirepsychicice

Boss CP: 44,686
Boss HP: 15,000
Raid timer: 300s
Party used: 6

Trainers needed, by attacker level

Scroll sideways for the mixed-lobby column.

Trainers needed to beat Roserade 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	3(2.48)	3(2.86)	4(3.41)	13:09	6.0
Level 25	3(2.14)	3(2.38)	3(2.84)	10:58	6.0
Level 30	2(1.89)	3(2.08)	3(2.43)	9:36	6.0
Level 35	2(1.80)	2(1.95)	3(2.32)	8:59	6.0
Level 40	2(1.73)	2(1.84)	3(2.21)	8:27	6.0
Level 45	2(1.64)	2(1.76)	3(2.12)	8:05	6.0
Level 50	2(1.59)	2(1.68)	3(2.05)	7:43	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.

2 trainers at level 40

Kyurem (White)1.73

A prepared party

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

2 trainers at level 40

Kyurem (White)1.73
Rayquaza1.76
Mewtwo1.82
Blacephalon1.85
Reshiram1.93
Kyurem (Black)1.95

A mixed local group

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

3 trainers at level 40

Heatran2.14
Enamorus (Incarnate)2.18
Eternatus2.17
Necrozma (Dawn Wings)2.16
Toucannon2.23
Volcarona2.24

The party these numbers assume

1. Kyurem (White)

Ice Fang + Ice Burn

2. Rayquaza

Air Slash + Dragon Ascent

3. Mewtwo

Psycho Cut + Psystrike

4. Blacephalon

Incinerate + Mind Blown

5. Reshiram

Fire Fang + Fusion Flare

6. Kyurem (Black)

Dragon Tail + Freeze Shock

See the full ranked counter list for Roserade · 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.