Cosmic Eclipse GX Pull Rate — 11.10% per pack (1 in 9)
11.10% of Cosmic Eclipse booster packs contain a GX card — roughly 1 in 9 packs. Cosmic Eclipse ships 16 GX cards in the pool, so the chance of pulling any specific GX is 0.0069 (≈1 in 144). These percentages come from PackRip's own rate table (the same constants the simulator runs on) — they are a model of the product, not a measurement of it. The Pokemon Company has never published pull rates.
Cosmic Eclipse GX pull-rate methodology
| Formula | Tier odds = 11.10% per pack; per-card odds = tier odds ÷ 16 GX cards = 1 in 144. |
|---|---|
| Assumptions | One independent rare-slot roll per pack; uniform selection within the tier; no pity timers, box mapping, short-print correction, or edition/condition split. |
| Data source | Set checklist and rarity labels from the bundled Pokemon TCG API catalog; tier rates from rareSlotRates(), mirrored from the live pack opener. |
| Update cadence | Regenerated by prerender whenever set metadata, catalog data, or pull-rate constants change. |
| Limitations | This is a theoretical per-pack rate. Real sealed product can show print-run variance, collation quirks, and market-specific edition differences. |
GX cards in Cosmic Eclipse
| # | Card | TCGplayer market | Per-card odds |
|---|---|---|---|
| 1 | Reshiram & Zekrom-GX #157 | $90.87 | 1 in 144 |
| 2 | Blastoise & Piplup-GX #38 | $85.72 | 1 in 144 |
| 3 | Togepi & Cleffa & Igglybuff-GX #143 | $61.70 | 1 in 144 |
| 4 | Solgaleo & Lunala-GX #75 | $36.80 | 1 in 144 |
| 5 | Charizard & Braixen-GX #22 | $36.39 | 1 in 144 |
| 6 | Arceus & Dialga & Palkia-GX #156 | $27.46 | 1 in 144 |
| 7 | Mega Lopunny & Jigglypuff-GX #165 | $27.09 | 1 in 144 |
| 8 | Venusaur & Snivy-GX #1 | $23.50 | 1 in 144 |
| 9 | Vileplume-GX #4 | $20.33 | 1 in 144 |
| 10 | Naganadel & Guzzlord-GX #158 | $10.34 | 1 in 144 |
| 11 | Silvally-GX #184 | $7.79 | 1 in 144 |
| 12 | Flygon-GX #110 | $2.62 | 1 in 144 |
| 13 | Alolan Persian-GX #129 | $2.24 | 1 in 144 |
| 14 | Volcarona-GX #35 | $2.22 | 1 in 144 |
| 15 | Oricorio-GX #95 | $2.02 | 1 in 144 |
| 16 | Wishiwashi-GX #63 | $1.57 | 1 in 144 |
How the 11.10% rate is computed
Every Cosmic Eclipse booster pack rolls one rare-slot card (plus uncommons, commons, and energy in fixed slots). The rare slot is itself a weighted random draw across 6 tiers — Rare, Holo Rare, GX, and the era's other chase rarities. The GX tier captures 11.10% of those rare-slot draws (= 11.10 packs out of every 100). Within the GX tier, all 16 cards share the slot uniformly, so per-card odds are 11.10% ÷ 16 = 0.0069 = 1 in 144.
This is the same math PackRip's live Cosmic Eclipse simulator uses to roll packs — open as many as you want for free, watch the empirical hit rate converge to the theoretical 11.10% over a large enough sample. Source code lives in src/utils/packGenerator.ts and the per-rarity drift is build-time-asserted against the published rates so the simulator and this landing page can never disagree.
Cumulative probability — how many packs to hit GX
GX pulls follow a geometric distribution with per-pack rate 0.111000. The expected number of packs until your first GX hit is 10; at 95% confidence you'll have one within 26 packs. Most experienced openers crack a sealed booster box (36 packs) and hit GX with probability 98.6% — so the average box yields just over 4.0 GX pulls.
Related on PackRip
- Open Cosmic Eclipse packs free — same pull rates, live RNG
- Cosmic Eclipse binder completion calculator
- Cosmic Eclipse per-pack expected value
- Top 25 most valuable Cosmic Eclipse cards
- Every GX card across all 140 booster sets