Xerneas IV Compromise — How Far Can You Go in Master League?
💯 CP 4275 · L50 · 시즌 27 (2026.06.02~09.09) · Updated 2026-09-01
Got a Xerneas 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 Xerneas, the IVs are tight, so a high catch is safest. Below is the result of running the Master top 100 through a battle simulator, plus the mirror and best buddy. (Hundo 1-shield record: 72W 28L.)
IV-tight — an effective hundo is safest. See the verdict below.
Build it or not — at a glance
✅Just build · 15/15/15 (effective hundo)
This Pokémon is IV-tight — aim for an effective hundo (or very close).
⚠️Conditional · around 15/15/14
You start dropping Raikou (Shadow) and similar. If you rarely face them (low real pick rate), it's fine to run.
❌Don't build yet · Low IVs (multiple cuts)
You lose several key matchups. Unless you need it now, wait for a better spread.
Why attack 15 is mandatory — CMP
Attack decides priority. Attack 14 always loses to a same-stat rival.
vsMirror (Groudon vs Groudon) Mine (atk 14) vs Foe (atk 15)
Verdict by IV spread (Master League sim)
| IVs (Atk/Def/Sta) | CP | HP | Verdict | Matchups lost |
|---|
| 15 / 15 / 15 | 4275 | 219 | Stat-hundo | none |
| 14 / 15 / 15 | 4259 | 219 | Compromise |  Hippowdon·shields2 |
| 15 / 15 / 14 | 4266 | 218 | Compromise |  Raikou (Shadow)·shields1 Landorus (Incarnate)·shields2 |
| 15 / 15 / 13 | 4258 | 217 | Compromise |  Sylveon·shields0Raikou (Shadow)·shields12 Latias (Shadow)·shields2Landorus (Incarnate)·shields2 |
| 15 / 15 / 12 | 4250 | 216 | Compromise | Sylveon·shields0Raikou (Shadow)·shields12Latias (Shadow)·shields2Landorus (Incarnate)·shields2 |
| 15 / 14 / 15 | 4264 | 219 | Compromise | Raikou (Shadow)·shields1Raikou·shields2 |
| 15 / 14 / 14 | 4256 | 218 | Compromise | Sylveon·shields0Raikou (Shadow)·shields12Latias (Shadow)·shields2Raikou·shields2Landorus (Incarnate)·shields2 |
| 15 / 14 / 13 | 4248 | 217 | Compromise | Sylveon·shields0Raikou (Shadow)·shields12Latias (Shadow)·shields2Raikou·shields2Landorus (Incarnate)·shields2 |
| 15 / 13 / 14 | 4245 | 218 | Compromise | Sylveon·shields0Raikou (Shadow)·shields12Latias (Shadow)·shields2Raikou·shields2Landorus (Incarnate)·shields2 |
| 15 / 13 / 13 | 4237 | 217 | Compromise | Sylveon·shields0 Groudon (Shadow)·shields1Raikou (Shadow)·shields12Latias (Shadow)·shields2Raikou·shields2Landorus (Incarnate)·shields2 |
| 15 / 12 / 14 | 4234 | 218 | Compromise | Sylveon·shields0Groudon (Shadow)·shields1Raikou (Shadow)·shields12Latias (Shadow)·shields2Raikou·shields2Landorus (Incarnate)·shields2 |
| 15 / 10 / 14 | 4213 | 218 | Compromise |  Zamazenta (Crowned Shield)·shields0Sylveon·shields0 Latios (Shadow)·shields1Groudon (Shadow)·shields1Raikou (Shadow)·shields12 Genesect (Chill)·shields1 Palkia·shields2Latias (Shadow)·shields2 Heatran (Shadow)·shields2Raikou·shields2Landorus (Incarnate)·shields2 |
Why attack 15 matters — CMP
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 Xerneas loses that priority to an attack-15 opponent. In the sim, the attack-14 mirror came out 0-shield=loss, 1-shield=tie, 2-shield=loss. In a mirror-heavy meta, attack 15 is effectively mandatory.
Where win/loss starts to split
Xerneas is IV-tight. Even dropping to 15/15/14 starts losing Raikou (Shadow). Across the full top-100 sim, small stat cuts cross breakpoints and flip matchups, so a high-IV catch is the safer play here.
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 1 matchups at 1 shield; against a best-buddied one (L51), 1. 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 시즌 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 4326 · L51
Best-buddying even a compromise improves every matchup and beats same-stat rivals.
Hundo record by shield count
Bottom line — IV-tight, aim high. Based on the 시즌 27 (2026.06.02~09.09) meta; updated when the season changes.
FAQ
Q. Do I need a hundo Xerneas?
Xerneas is IV-tight, so an effective hundo (or very close) is safest. From 15/15/14 you start losing Raikou (Shadow). That said, if those losses are low-pick-rate, the real impact may be small.
Q. Which stat should I prioritize?
From the full top-100 sim, the line 15/15/15 is safe; below it you begin losing Raikou (Shadow).
Q. How long does this hold?
It's the 시즌 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
These verdicts come from simulating each spread against the entire Master League top-100 across 0-, 1-, and 2-shield scenarios with the open-source PvPoke battle engine. If no matchup flips versus a hundo it's 'battle-equal'; if stats and CP are identical too it's 'stat-hundo'; if any matchup is lost it's 'compromise'.
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