Shadow Rhyperior IV Compromise — How Far Can You Go in Master League?
💯 CP 4221 · L50 · 시즌 27 (2026.06.02~09.09) · Updated 2026-09-01
Got a Shadow Rhyperior 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 Shadow Rhyperior, 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: 46W 54L.)
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 Xerneas 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 | 4221 | 223 | Stat-hundo | none |
| 14 / 15 / 15 | 4204 | 223 | Compromise |  Giratina (Origin)·shields2 |
| 15 / 15 / 14 | 4213 | 222 | Compromise |  Xerneas·shields0 |
| 15 / 15 / 13 | 4205 | 221 | Compromise | Xerneas·shields0 |
| 15 / 15 / 12 | 4197 | 220 | Compromise |  Lunala·shields0Xerneas·shields0 |
| 15 / 14 / 15 | 4210 | 223 | Compromise | Xerneas·shields0 |
| 15 / 14 / 14 | 4202 | 222 | Compromise | Xerneas·shields0 |
| 15 / 14 / 13 | 4194 | 221 | Compromise | Xerneas·shields0 |
| 15 / 13 / 14 | 4192 | 222 | Compromise | Xerneas·shields0 |
| 15 / 13 / 13 | 4184 | 221 | Compromise | Lunala·shields0Xerneas·shields0 |
| 15 / 12 / 14 | 4182 | 222 | Compromise | Lunala·shields0Xerneas·shields0 |
| 15 / 10 / 14 | 4161 | 222 | Compromise | Lunala·shields0Xerneas·shields0Rhyperior·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 Shadow Rhyperior 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=tie. In a mirror-heavy meta, attack 15 is effectively mandatory.
Where win/loss starts to split
Shadow Rhyperior is IV-tight. Even dropping to 15/15/14 starts losing Xerneas. 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 4 matchups at 1 shield; against a best-buddied one (L51), 0. 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 4271 · 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 Shadow Rhyperior?
Shadow Rhyperior is IV-tight, so an effective hundo (or very close) is safest. From 15/15/14 you start losing Xerneas. 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 Xerneas.
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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