Top 10 Undervalued Pokémon GX Cards from the Sun & Moon Era (2025 Guide)

Top 10 Undervalued Pokémon GX Cards from the Sun & Moon Era (2025 Guide)

The Pokémon Sun & Moon era (2017–2020) introduced the powerful GX mechanic—and with it, a flood of stunning new cards. From dazzling full arts to textured rainbow rares, GX cards helped define modern collecting. But in today’s hype-driven market, many of these gems have slipped through the cracks. In this guide, we shine a spotlight on the top 10 most undervalued GX Pokémon cards—cards that pack big collector appeal and long-term potential but are currently trading well below their worth. Whether you’re a seasoned collector or just diving into Pokémon GX investment in 2025, these picks offer serious upside.

10. Espeon GX (Sun & Moon Base Set – Full Art #140)

  • Current Raw Price: ~$15

  • Why It’s Undervalued: As one of the first Eeveelution GX cards from the S&M base set, Espeon GX was heavily overshadowed by Umbreon GX and later evolutions. Yet Espeon has a massive fanbase and the full art version features beautiful soft purple tones with textured shimmer. Its print run was fairly large, but many early players used and abused their copies in decks—so mint versions are becoming harder to find. As Espeon continues to gain popularity, especially among Gen 2 collectors, this early GX card has room to grow.

9. Solgaleo GX (SM104 Promo – Full Art)

  • Current Raw Price: ~$10–$12

  • Why It’s Undervalued: As the Sun cover legendary of the era, Solgaleo should command far more collector interest. This particular promo, with its silver and gold design and full-body profile, looks incredible in a binder or slab. Solgaleo GX promos were included in tins and boxes, but the full-art version (SM104) is harder to find in top condition. It also holds nostalgic value as one of the first big cards many collectors encountered when the Sun & Moon era launched. Given its legendary status, it’s currently undervalued relative to its visual impact and collectibility.

8. Guzzlord GX (Crimson Invasion – Secret Rare #112)

  • Current Raw Price: ~$12

  • Why It’s Undervalued: Guzzlord may not be a top-tier fan favorite, but this black and gold secret rare GX is absolutely jaw-dropping. As one of the few all-black Pokémon cards ever released, it holds aesthetic appeal for collectors chasing unique cards. Guzzlord also has a cult following due to its meme-worthy status and monstrous design. With low population in high grades and striking artwork that stands apart from most GXs, this is a budget banger for collectors looking to invest in rarer designs.

7. Zoroark GX (Shining Legends – Full Art #77)

  • Current Raw Price: ~$18

  • Why It’s Undervalued: Zoroark GX dominated the competitive TCG scene during its time, making this card highly sought after by players. Unfortunately, that also meant many copies were well-loved and played, leaving fewer near-mint or mint copies behind. The full art version has gorgeous red-and-black stylings and is from the popular mini-set Shining Legends, which had no booster boxes. Zoroark has a strong fanbase and has appeared in multiple games, anime arcs, and movies. This card is a sleeper with room to spike as the set becomes scarcer.

6. Glaceon GX (Ultra Prism – Full Art #133)

  • Current Raw Price: ~$17

  • Why It’s Undervalued: Glaceon has quietly become one of the most beloved Eeveelutions, and this full art GX is both beautiful and rare. Ultra Prism had a relatively short print run compared to other S&M sets, and Glaceon’s icy blue coloring paired with silver highlights looks amazing in person. While Umbreon and Sylveon have seen sharp increases in recent years, Glaceon GX has lagged behind—but collectors are beginning to catch on. Expect this card to climb as Eeveelution demand continues to surge.

5. Sylveon GX (Guardians Rising – Full Art #140)

  • Current Raw Price: ~$22

  • Why It’s Undervalued: Sylveon is one of the most popular Pokémon among modern collectors—particularly younger audiences—and this is its first big full art GX card. The pink-and-white palette, paired with Sylveon’s dreamy pose and solid texture, makes this card a display favorite. While Sylveon’s VMAX alt art from Evolving Skies commands high prices, this GX remains relatively cheap. With strong waifu appeal and low competition among earlier Sylveon cards, this one may not stay under $25 for long.

4. Darkrai GX (Burning Shadows – Full Art #139)

  • Current Raw Price: ~$14

  • Why It’s Undervalued: Darkrai is a consistent fan-favorite legendary, especially among those who grew up during the DS-era (Diamond/Pearl/Platinum). This full art version from Burning Shadows showcases a vivid, haunting contrast of black, purple, and red. Despite the popularity of the Pokémon and its presence in multiple games and movies, this card remains extremely accessible in raw form. With Darkrai being a staple in collectible Pokémon mythology and relatively few modern reprints, this GX feels poised for a breakout.

3. Mimikyu GX (SM99 Promo – Full Art)

  • Current Raw Price: ~$11–$13

  • Why It’s Undervalued: Mimikyu is one of the most beloved Gen VII Pokémon and consistently ranks in top-10 fan-favorite polls. This SM99 Black Star Promo features Mimikyu in an eerie, glitchy pose, with incredible foil shine and a holographic swirl pattern that makes it one of the most visually appealing promo GX cards. It came in a Mimikyu Pin Collection box and isn’t available from packs—meaning sealed supply is now limited. With Mimikyu’s fanbase and the unique artwork, this promo is an undervalued collector’s sleeper.

2. Reshiram & Charizard GX (Unbroken Bonds – Full Art #217)

  • Current Raw Price: ~$35–$40

  • Why It’s Undervalued: Yes, Charizard is on the list—and it’s still underrated. This card was the chase in Unbroken Bonds, yet the non-rainbow full art version remains relatively affordable compared to its secret rare counterparts. Featuring two iconic legendaries and excellent tag-team synergy, this card is part of a beloved set and still sells consistently in high grades. As graded PSA 10s surpass $150, raw copies in the $30 range are undervalued. For Charizard collectors, this is one of the few modern full art Charizards under $50—and that may not last long.

1. Gengar & Mimikyu GX (Team Up – Full Art #165)

  • Current Raw Price: ~$25–$30

  • Why It’s Undervalued: Team Up is one of the most sought-after Sun & Moon sets, and this tag-team card pairs two of the most beloved ghost-types: Gengar and Mimikyu. The full art features bold color, spooky atmosphere, and a lively composition. Both Pokémon are fan darlings, and the card has historic relevance as part of the first tag-team wave in Pokémon TCG. Raw prices are creeping up, and PSA 10s have reached over $120. With sealed Team Up products now extremely scarce, this card feels like a future trophy card for mid-tier investors and collectors alike.

Final Thoughts: Why Sun & Moon GX Cards Are Heating Up

The Sun & Moon GX era is now far enough behind us that nostalgia is starting to kick in—but it’s still recent enough that prices haven’t skyrocketed across the board. Many GX cards are flying under the radar as collectors focus on Sword & Shield alt arts or Scarlet & Violet illustration rares. But savvy buyers know that now is the time to scoop up GX cards with strong artwork, popular characters, and low prices before supply shrinks and prices rise.

Whether you’re a Charizard chaser, an Eeveelution enthusiast, or just love the shimmer of textured GX cards, these undervalued picks offer a great blend of visual appeal and investment potential. Keep them on your radar—or better yet, in your binder—while they’re still affordable.

Back to blog