Got a Reshiram you've been scraping XL for, and it didn't come out 100%? Before you power up — 30 seconds. We simulated the entire Master top 100 to see whether that spread is fine to build.
For Reshiram, attack 15 is effectively mandatory, and the compromise line is about 15/15/14. Below is the result of running the Master top 100 through a battle simulator, plus the mirror and best buddy. (Hundo 1-shield record: 59W 41L.)
Compromise IVs
15/15/14
At L50, at or above this the win/loss matchups match a hundo.
Build it or not — at a glance
✅
Just build · 15/15/14 or better
Win/loss matchups are effectively identical to a hundo. Just power it up.
⚠️
Conditional · around 15/15/13
You start dropping Gyarados (Shadow) and similar. If you rarely face them (low real pick rate), it's fine to run.
❌
Don't build yet · Attack 14 or below
Reshiram always loses CMP priority to the mirror at attack 14. Don't build it — wait for a better one.
🔬 Full-meta sim — all 100, who you meet & beat
1-on-1 battles vs the Master League top 100, per shield. Green = win, red = loss. (Rating 500 = even; higher = more comfortable.)
59W59%41L
540
339
834
532
513
385
230
500
485
627
527
500
554
500
436
371
366
801
540
363
546
692
312
902
641
535
485
505
369
307
801
260
230
845
302
576
668
760
625
337
671
605
391
608
581
424
573
495
510
505
487
393
473
625
241
641
456
573
597
646
875
586
502
736
513
875
714
226
314
438
281
695
226
538
300
747
241
597
456
576
619
730
711
701
600
584
250
237
665
747
218
657
433
730
315
671
611
252
866
548
⭐ Best Buddy (L51) effect — newly won matchups
Opponents you newly beat once best-buddied. The result depends on whether the opponent is best-buddied too, so both cases are shown.
Opp not BB (L50) · +5W
⭐
⭐
⭐
⭐
⭐
Opp also BB (L51) · +2W
⭐
⭐
※ The mirror and same-stat rival return to a tie when the opponent is best-buddied too (both L51). So Best Buddy only wins the mirror when the opponent isn't best-buddied.
Why attack 15 is mandatory — CMP
Attack decides priority. Attack 14 always loses to a same-stat rival.
vsMirror (Reshiram vs Reshiram)
Mine (atk 14) vs Foe (atk 15)
shields0
패
328
shields1
패
480
shields2
패
467
Verdict by IV spread (Master League sim)
💡 15/15/15 at the top is the perfect IV (best); rows go to lower IVs downward.
Perfect·Battle-equal= win/loss identical to a hundo (no disadvantage — just use it).
Fine= it only loses to weaker (non-top) opponents, so it's acceptable to run.
N lost= it starts losing to N strong top-10 opponents — a real disadvantage.
CMP loss= at attack 14 you always lose the mirror / same-stat rivals.
‘Matchups lost’ = opponents you newly lose to at that spread (0/1/2 shields = how many shields are used).
Master League has no CP cap, so everyone is max level. When same-species (mirror) or same-stat Pokémon fire a charged move on the same turn, the higher effective attack goes first (CMP). An attack-14 Reshiram loses that priority to an attack-15 opponent. In the sim, the attack-14 mirror came out 0-shield=loss, 1-shield=loss, 2-shield=loss. In a mirror-heavy meta, attack 15 is effectively mandatory.
Where win/loss starts to split
Down to 15/15/14, win/loss matches a hundo. Below that, at 15/15/13, you begin losing Gyarados (Shadow) — that's the breakpoint line.
Best Buddy — depends on whether the opponent is too
Best Buddy (level +1) depends on whether the opponent is best-buddied. Against a non-best-buddied opponent (L50) you newly win 5 matchups at 1 shield; against a best-buddied one (L51), 2. Top Master legendaries are usually best-buddied, so the mirror and same-stat rivals go back to a tie when both are L51. It never hurts, but it doesn't magically win the mirror.
Note that this line moves with the meta. If usage shifts or a new Pokémon arrives, the breakpoints move and a spread that's fine today can get shaky. This analysis is for Season 27 (2026.06.02~09.09); when the season changes we re-run the full top-100 sim and update it.
⭐Best Buddy (L51) effectBB CP 4620 · L51
Best-buddying even a compromise improves every matchup and beats same-stat rivals.
Hundo record by shield count
shields 0
65W · 35L
shields 1
59W · 41L
shields 2
61W · 39L
Bottom line — attack 15 is non-negotiable (mirror CMP), compromise line 15/15/14. Based on the Season 27 (2026.06.02~09.09) meta; updated when the season changes.
FAQ
Q. Do I need a hundo Reshiram?
No. Down to 15/15/14, win/loss matchups are effectively identical to a hundo. At or above that, just power it up.
Q. Attack is 14 — can I just build it?
Not recommended. At attack 14 you lose CMP priority to the mirror and same-stat rivals — a fight that should be 50:50 becomes 0:100.
Q. How long does this hold?
It's the Season 27 (2026.06.02~09.09) meta. When the meta shifts, the breakpoints and the compromise line move, so we re-run the full top-100 sim each season and update it.
Method
BasisSeason 27 (2026.06.02~09.09)ScopeMaster League Top 100Shields0 · 1 · 2Level50 / Best Buddy 51Battle engineGBL Note Simulator (PvPoke-based)Baseline15/15/15Last calculated2026-09-01
✔ Calculated & analyzed by GBL Note
These verdicts come from simulating each spread against the entire Master League top-100 across 0/1/2-shield scenarios with the open-source PvPoke engine. If no matchup flips versus a hundo it's 'Perfect/Battle-equal'; if it only loses to weaker (non-top) opponents it's 'Fine'; once it loses to a top-10 opponent it's 'N lost' by the number of losses. Attack 14 loses mirror priority — 'CMP loss'.
