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PSA 10 · Gem Mint · Gardevoir

Gardevoir PSA 10 Prices & Population

UltraBall tracks 56 English Gardevoir cards, 53 of them with a PSA 10 price. In the 90 days to Oct 3, 2026, PSA's sales record shows 1,232 Gardevoir PSA 10 sales worth $1,001,410, across the 44 cards it has sales for. PSA 10s run from $33.60 (Mega Gardevoir ex 60/132, Mega Evolution) to $33,900 (Gardevoir 109/108, Dark Explorers).

Prices as of Oct 15, 2026. Sales on PSA's record through Oct 3, 2026. PSA population counts as PSA publishes them.

Gardevoir cards tracked
56
With a PSA 10 price
53
PSA 10 population
62,751
PSA graded, all grades
155,881
Median gem rate (100+ graded)
27%
PSA 10 sales, 90 days
1,232
PSA 10 sales value, 90 days
$1,001,410
Median PSA 10 price
$352
Median PSA 10 over raw
25×
Most valuable PSA 10
$33,900
Gardevoir 109/108, Dark Explorers

Gardevoir PSA 10 Market Index

How Gardevoir PSA 10 prices have moved

Level
96.8
30 days
-3.7%
90 days
–
Index too young
Since Aug 1, 2026
-3.2%

▼ -3.2% Aug 1, 2026 to Oct 15, 2026

96.5100.9Aug 1, 2026Sep 7, 2026Oct 15, 202696.8

The 24 most traded Gardevoir PSA 10 slabs, weighted by price times 90-day sales, chained daily from 100 on Aug 1, 2026, on the same method as UltraBall's market indexes. Built only where 20 or more Gardevoir slabs trade often enough. No one-year figure until the index has a year behind it.

Ranked by PSA 10 price

Most valuable Gardevoir PSA 10s

  1. Gardevoir 109/108, Dark Explorers

    1. Gardevoir 109/108

    Dark Explorers

    $33,900

    PSA 9
    $3,324
    Raw
    $1,000
    PSA 10 pop
    29
    Gem rate
    6.0%
    Sold 90d
    0
  2. Gardevoir ex 96/100, Sandstorm

    2. Gardevoir ex 96/100

    Sandstorm

    $22,000

    PSA 9
    $899
    Raw
    $250
    PSA 10 pop
    65
    Gem rate
    3.6%
    Sold 90d
    3
  3. Gardevoir ex δ 93/101, Dragon Frontiers

    3. Gardevoir ex δ 93/101

    Dragon Frontiers

    $10,500

    PSA 9
    $2,160
    Raw
    $199
    PSA 10 pop
    33
    Gem rate
    4.3%
    Sold 90d
    0
  4. Gardevoir 7/109, Ruby & Sapphire

    4. Gardevoir 7/109

    Ruby & Sapphire

    $10,000

    PSA 9
    $1,200
    Raw
    $57.95
    PSA 10 pop
    17
    Gem rate
    2.7%
    Sold 90d
    1
  5. Gardevoir 57/99, Next Destinies

    5. Gardevoir 57/99

    Next Destinies

    $7,800

    PSA 9
    $75.00
    Raw
    $12.00
    PSA 10 pop
    13
    Gem rate
    10%
    Sold 90d
    3
  6. Gardevoir δ 6/113, Delta Species

    6. Gardevoir δ 6/113

    Delta Species

    $6,400

    PSA 9
    $399
    Raw
    $150
    PSA 10 pop
    65
    Gem rate
    14%
    Sold 90d
    4
  7. Gardevoir-EX RC30, Generations

    7. Gardevoir-EX RC30

    Generations

    $5,280

    PSA 9
    $263
    Raw
    $75.00
    PSA 10 pop
    123
    Gem rate
    2.4%
    Sold 90d
    5
  8. Gardevoir 7/132, Secret Wonders

    8. Gardevoir 7/132

    Secret Wonders

    $5,000

    PSA 9
    $2,225
    Raw
    $65.00
    PSA 10 pop
    11
    Gem rate
    3.6%
    Sold 90d
    0
  9. M Gardevoir-EX RC31, Generations

    9. M Gardevoir-EX RC31

    Generations

    $4,325

    PSA 9
    $274
    Raw
    $93.54
    PSA 10 pop
    374
    Gem rate
    4.5%
    Sold 90d
    22
  10. Gardevoir 4/106, Emerald

    10. Gardevoir 4/106

    Emerald

    $4,320

    PSA 9
    $209
    Raw
    $35.00
    PSA 10 pop
    19
    Gem rate
    5.5%
    Sold 90d
    2
  11. Gardevoir & Sylveon-GX 205/214, Unbroken Bonds

    11. Gardevoir & Sylveon-GX 205/214

    Unbroken Bonds

    $3,600

    PSA 9
    $1,215
    Raw
    $898
    PSA 10 pop
    1,893
    Gem rate
    44%
    Sold 90d
    79
  12. Gardevoir 8/127, Platinum

    12. Gardevoir 8/127

    Platinum

    $3,263

    PSA 9
    $161
    Raw
    $43.99
    PSA 10 pop
    8
    Gem rate
    4.5%
    Sold 90d
    0

Easiest Gardevoir to gem

Highest PSA 10 rate, cards with 100+ PSA graded

CardPSA 10sGradedGem rate
Gardevoir VMAX 17/73Champion's Path2,4593,24976%
Gardevoir VMAX 76/73Champion's Path3,2214,50072%
Gardevoir V 70/73Champion's Path1,7142,55067%
Gardevoir ex δ 93/25Celebrations: Classic Collection2,8184,36365%
Mega Gardevoir ex 178/132Mega Evolution12,41919,77863%
Gardevoir-GX SV75Hidden Fates Shiny Vault2,9124,70062%
Gardevoir V 16/73Champion's Path7301,23659%
Mega Gardevoir ex 159/132Mega Evolution3,2255,47759%
Mega Gardevoir ex 60/132Mega Evolution6651,17357%
Gardevoir & Sylveon-GX 204/214Unbroken Bonds9421,78853%

Hardest Gardevoir to gem

Lowest PSA 10 rate, cards with 100+ PSA graded

CardPSA 10sGradedGem rate
Gardevoir-EX 155/160Primal Clash84141.9%
Gardevoir-EX RC30Generations1235,0362.4%
Gardevoir 7/109Ruby & Sapphire176362.7%
Gardevoir 7/132Secret Wonders113063.6%
Gardevoir RC10Legendary Treasures205553.6%
Gardevoir ex 96/100Sandstorm651,8023.6%
Gardevoir ex δ 93/101Dragon Frontiers337674.3%
M Gardevoir-EX RC31Generations3748,3144.5%
Gardevoir 8/127Platinum81764.5%
Gardevoir 4/106Emerald193435.5%

Gem rate is the share of PSA-graded copies that came back a 10. A rate off a handful of copies says more about who sent them in than about the card, so these two lists only count cards with at least 100 graded. The median Gardevoir card on them gems at 32%.

Rarest PSA 10 populations

Lowest-pop Gardevoir PSA 10s

CardPSA 10sGradedGem ratePSA 10Low because
Gardevoir 69/195Silver Tempest715–$100Few sent in
Gardevoir 8/127Platinum81764.5%$3,263Hard to grade
Gardevoir-EX 155/160Primal Clash84141.9%$993Hard to grade
Gardevoir 61/198Chilling Reign103330%$153Few sent in
Gardevoir 7/132Secret Wonders113063.6%$5,000Hard to grade
Gardevoir 57/99Next Destinies1312410%$7,800Hard to grade
Gardevoir 7/109Ruby & Sapphire176362.7%$10,000Hard to grade
Gardevoir-EX 105/160Primal Clash181889.6%$720Hard to grade
Gardevoir 4/106Emerald193435.5%$4,320Hard to grade
Gardevoir 141/214Lost Thunder195038%$1,275Few sent in

A low population is not the same as a hard card. “Few sent in” means few copies have been graded at all, or they gem at a normal rate; “Hard to grade” means at least 100 have been graded and they come back a 10 at under half the median Gardevoir rate.

Most graded Gardevoir cards

What collectors send to PSA most

CardGradedPSA 10sPSA 9sGem rate
Gardevoir ex 233/91Paldean Fates22,4639,52710,78242%
Mega Gardevoir ex 178/132Mega Evolution19,77812,4196,34663%
Gardevoir ex 245/198Scarlet & Violet18,6076,8469,20137%
Mega Gardevoir ex 187/132Mega Evolution8,9911,9584,59522%
M Gardevoir-EX RC31Generations8,3143741,6624.5%
Mega Gardevoir ex 159/132Mega Evolution5,4773,2251,91759%
Gardevoir-EX RC30Generations5,0361239552.4%
Gardevoir-GX SV75Hidden Fates Shiny Vault4,7002,9121,52662%
Gardevoir VMAX 76/73Champion's Path4,5003,2211,10872%
Gardevoir & Sylveon-GX 130/214Unbroken Bonds4,3972,1221,63148%

Big population, thin trading

100+ PSA 10s, fewest PSA 10 sales for their population

CardPSA 10sSold 90dPSA 10
Gardevoir V 16/73Champion's Path7303$40.80
Gardevoir ex 86/198Scarlet & Violet1731$65.00
Gardevoir ex 228/198Scarlet & Violet5285$68.00
Gardevoir ex 245/198Scarlet & Violet6,84675$202
Gardevoir ex 233/91Paldean Fates9,527107$352
Gardevoir-GX 93/147Burning Shadows2263$114
Gardevoir-GX SV75Hidden Fates Shiny Vault2,91243$140
Gardevoir ex 217/91Paldean Fates73914$120
Radiant Gardevoir 69/196Lost Origin94920$79.60
Gardevoir ex δ 93/25Celebrations: Classic Collection2,81861$76.50

Biggest PSA 10 premium over raw

PSA 10 price over the raw near-mint price, both at least $5

CardRawPSA 10Premium
Gardevoir 57/99Next Destinies$12.00$7,800650×
Gardevoir 7/109Ruby & Sapphire$57.95$10,000173×
Gardevoir RC10Legendary Treasures$14.29$2,000140×
Gardevoir 4/106Emerald$35.00$4,320123×
Gardevoir ex 96/100Sandstorm$250$22,00088×
Gardevoir-EX 105/160Primal Clash$8.94$72081×
Gardevoir 7/132Secret Wonders$65.00$5,00077×
Gardevoir 8/127Platinum$43.99$3,26374×
Gardevoir-EX RC30Generations$75.00$5,28070×
Gardevoir ex δ 93/101Dragon Frontiers$199$10,50053×

Where the jump from 9 to 10 is widest

PSA 10 price over the PSA 9 price

CardPSA 9PSA 10GapPremiumGem rate
Gardevoir 57/99Next Destinies$75.00$7,800$7,725104×10%
Gardevoir 141/214Lost Thunder$23.00$1,275$1,25255×38%
Gardevoir-GX 159/147Burning Shadows$51.00$2,032$1,98140×12%
Gardevoir ex 96/100Sandstorm$899$22,000$21,10124×3.6%
Gardevoir 4/106Emerald$209$4,320$4,11121×5.5%
Gardevoir 8/127Platinum$161$3,263$3,10220×4.5%
Gardevoir-EX RC30Generations$263$5,280$5,01720×2.4%
Gardevoir-EX 105/160Primal Clash$40.00$720$68018×9.6%
Gardevoir δ 6/113Delta Species$399$6,400$6,00116×14%
M Gardevoir-EX RC31Generations$274$4,325$4,05116×4.5%

Most actively traded

The Gardevoir PSA 10s that change hands most

CardSold 30dSold 90d90d value90d medianLatest sale
Mega Gardevoir ex 178/132Mega Evolution73312$110,979$365$344 Oct 3, 2026, eBay
Gardevoir ex 233/91Paldean Fates30107$40,240$377$392 Oct 3, 2026, eBay
Mega Gardevoir ex 187/132Mega Evolution2183$48,481$570$515 Oct 1, 2026, eBay
Gardevoir & Sylveon-GX 205/214Unbroken Bonds1679$383,103$4,677$3,550 Oct 3, 2026, eBay
Mega Gardevoir ex 159/132Mega Evolution2777$3,539$45.88$35.00 Oct 2, 2026, eBay
Gardevoir ex 245/198Scarlet & Violet1875$17,158$229$190 Oct 3, 2026, eBay
Gardevoir ex δ 93/25Celebrations: Classic Collection1761$4,545$72.00$67.99 Oct 3, 2026, eBay
Gardevoir & Sylveon-GX 130/214Unbroken Bonds1551$19,485$383$400 Oct 3, 2026, eBay
Gardevoir-GX SV75Hidden Fates Shiny Vault1243$5,797$135$125 Oct 3, 2026, eBay
Mega Gardevoir ex 60/132Mega Evolution1437$1,158$30.00$53.01 Oct 3, 2026, eBay

Cert-linked PSA 10 sales on PSA's record, each one slab: eBay, Fanatics Collect, Goldin and Heritage, plus reported auction results PSA's record misses. It runs about ten days behind, so the 30-day count is low for the newest days.

Recent verified PSA 10 sales

The newest Gardevoir PSA 10 sales

Through Oct 3, 2026

By era

Gardevoir PSA 10s, era by era

CardsOne of eachPSA 10sPSA gradedMedian gem rateSold 90d90d valueTop PSA 10
EX6$54,2102524,3884.9%16$95,840Gardevoir ex 96/100 $22,000
Diamond & Pearl1$5,000113063.6%––Gardevoir 7/132 $5,000
Platinum1$3,26381764.5%––Gardevoir 8/127 $3,263
Black & White3$43,700621,1616.0%3$18,000Gardevoir 109/108 $33,900
XY10$16,0034,36927,41115%156$214,644Gardevoir-EX RC30 $5,280
Sun & Moon9$8,8218,79418,33842%219$435,253Gardevoir & Sylveon-GX 205/214 $3,600
Sword & Shield11$1,16913,00122,35762%119$13,890Gardevoir TG05 $300
Scarlet & Violet6$85217,90844,90040%204$59,304Gardevoir ex 233/91 $352
Mega Evolution6$1,11518,31635,49758%515$164,478Mega Gardevoir ex 187/132 $565

By set

The sets that lead Gardevoir's PSA 10 market

Top 15 by 90-day PSA 10 sales value

CardsOne of eachPSA 10sPSA gradedMedian gem rateSold 90d90d valueTop PSA 10
Unbroken Bonds4$5,0955,50011,83746%170$422,762Gardevoir & Sylveon-GX 205/214 $3,600
Mega Evolution4$92918,26735,41958%509$164,157Mega Gardevoir ex 187/132 $565
Generations2$9,60549713,3503.5%27$117,272Gardevoir-EX RC30 $5,280
Steam Siege5$3,9263,82113,01733%128$96,652Gardevoir-EX 116/114 $2,350
Sandstorm1$22,000651,8023.6%3$57,750Gardevoir ex 96/100 $22,000
Paldean Fates3$51710,36124,70142%123$41,843Gardevoir ex 233/91 $352
Next Destinies1$7,8001312410%3$18,000Gardevoir 57/99 $7,800
Scarlet & Violet3$3357,54720,19937%81$17,461Gardevoir ex 245/198 $202
Delta Species1$6,4006546014%4$14,529Gardevoir δ 6/113 $6,400
Ruby & Sapphire1$10,000176362.7%1$10,000Gardevoir 7/109 $10,000
Emerald1$4,320193435.5%2$7,320Gardevoir 4/106 $4,320
Burning Shadows3$2,3113631,75115%6$6,695Gardevoir-GX 159/147 $2,032
Power Keepers1$9905338014%6$6,241Gardevoir 9/108 $990
Silver Tempest Trainer Gallery1$2207893,13825%26$5,906Gardevoir TG05 $220
Hidden Fates Shiny Vault1$1402,9124,70062%43$5,797Gardevoir-GX SV75 $140

Every card

Every Gardevoir PSA 10

53 cards

53 of 53
Gardevoir 109/108Dark Explorers2012$1,000$3,324$33,900294826.0%00+16.4%34×10×
Gardevoir ex 96/100Sandstorm2003$250$899$22,000651,8023.6%33+55.7%88×24×
Gardevoir ex δ 93/101Dragon Frontiers2006$199$2,160$10,500337674.3%000.0%53×4.9×
Gardevoir 7/109Ruby & Sapphire2003$57.95$1,200$10,000176362.7%11–173×8.3×
Gardevoir 57/99Next Destinies2012$12.00$75.00$7,8001312410%23+42.9%650×104×
Gardevoir δ 6/113Delta Species2005$150$399$6,4006546014%44+27.0%43×16×
Gardevoir-EX RC30Generations2016$75.00$263$5,2801235,0362.4%25+1.4%70×20×
Gardevoir 7/132Secret Wonders2007$65.00$2,225$5,000113063.6%00+11.5%77×2.2×
M Gardevoir-EX RC31Generations2016$93.54$274$4,3253748,3144.5%722-15.2%46×16×
Gardevoir 4/106Emerald2005$35.00$209$4,320193435.5%12+48.2%123×21×
Gardevoir & Sylveon-GX 205/214Unbroken Bonds2019$898$1,215$3,6001,8934,28144%1679-19.5%4.0×3.0×
Gardevoir 8/127Platinum2009$43.99$161$3,26381764.5%00-8.9%74×20×
Gardevoir-EX 116/114Steam Siege2016$99.99$236$2,3507993,80621%1130+9.0%24×10.0×
Gardevoir-GX 159/147Burning Shadows2017$46.61$51.00$2,0327361712%33-4.8%44×40×
Gardevoir RC10Legendary Treasures2013$14.29$153$2,000205553.6%000.0%140×13×
Gardevoir 141/214Lost Thunder2018$2.42$23.00$1,275195038%––––55×
Gardevoir-EX 155/160Primal Clash2015$54.95$478$99384141.9%––-0.8%18×2.1×
Gardevoir 9/108Power Keepers2007$21.40$159$9905338014%160.0%46×6.2×
M Gardevoir-EX 106/160Primal Clash2015$20.00$300$759254425.7%00+22.2%38×2.5×
Gardevoir-EX 105/160Primal Clash2015$8.94$40.00$720181889.6%11+51.1%81×18×
Gardevoir & Sylveon-GX 225/214Unbroken Bonds2019$155$190$6905431,37140%414-2.1%4.5×3.6×
M Gardevoir-EX 112/114Steam Siege2016$42.20$90.00$5971,3684,14933%1236+1.6%14×6.6×
Gardevoir-EX 111/114Steam Siege2016$20.00$70.30$5965261,88528%1328-0.3%30×8.5×
Mega Gardevoir ex 187/132Mega Evolution2025$165$145$5651,9588,99122%2183+2.2%3.4×3.9×
Gardevoir & Sylveon-GX 204/214Unbroken Bonds2019$105$116$4259421,78853%626-5.8%4.0×3.7×
Gardevoir & Sylveon-GX 130/214Unbroken Bonds2019$68.60$81.00$3802,1224,39748%1551-4.4%5.5×4.7×
Gardevoir ex 233/91Paldean Fates2024$145$139$3529,52722,46342%30107-11.4%2.4×2.5×
Gardevoir TG05Astral Radiance Trainer Gallery2022$6.70$29.00$3002811,26122%48+17.0%45×10×
Mega Gardevoir ex 178/132Mega Evolution2025$165$137$28812,41919,77863%73312-11.2%1.7×2.1×
M Gardevoir-EX 79/114Steam Siege2016$20.00$49.48$2319492,71135%622+5.2%12×4.7×
Gardevoir TG05Silver Tempest Trainer Gallery2022$6.89$22.80$2207893,13825%726+2.5%32×9.6×
Gardevoir ex 245/198Scarlet & Violet2023$64.70$77.00$2026,84618,60737%1875-13.2%3.1×2.6×
Gardevoir-GX 140/147Burning Shadows2017$19.99$32.52$1656442215%––+21.9%8.3×5.1×
Gardevoir 61/198Chilling Reign2021$1.82$26.77$153103330%01––5.7×
Gardevoir-EX 78/114Steam Siege2016$5.81$35.00$15217946638%212+7.6%26×4.3×
Gardevoir-GX SV75Hidden Fates Shiny Vault2019$66.90$65.00$1402,9124,70062%1243-7.8%2.1×2.2×
Gardevoir ex 217/91Paldean Fates2024$8.07$38.00$1207392,02037%214+30.0%15×3.2×
Gardevoir-GX 93/147Burning Shadows2017$7.06$30.00$11422671232%23+17.4%16×3.8×
Gardevoir 69/195Silver Tempest2022$0.29$23.00$100715–––+0.9%–4.3×
Mega Gardevoir ex 89/217Ascended Heroes2026$0.76$12.50$99.99497863%16+165.1%–8.0×
M Gardevoir-EX 106/3030th Celebration: Classic Collection2026$11.00$24.70$86.53––––––7.9×3.5×
Radiant Gardevoir 69/196Lost Origin2022$1.68$24.99$79.609491,93149%520-7.4%–3.2×
Gardevoir ex δ 93/25Celebrations: Classic Collection2021$9.35$30.80$76.502,8184,36365%1761+10.0%8.2×2.5×
Gardevoir ex 228/198Scarlet & Violet2023$5.30$30.00$68.005281,08749%050.0%13×2.3×
Gardevoir ex 86/198Scarlet & Violet2023$0.69$22.00$65.0017350534%010.0%–3.0×
Gardevoir V SWSH105SWSH Black Star Promos2019$2.16$45.00$58.00238128%––0.0%–1.3×
Gardevoir VMAX 76/73Champion's Path2020$14.99$20.49$55.903,2214,50072%––-8.5%3.7×2.7×
Gardevoir ex 29/91Paldean Fates2024$0.82$19.00$45.009521844%02-1.1%–2.4×
Gardevoir V 70/73Champion's Path2020$4.27$19.20$43.201,7142,55067%––-2.0%–2.3×
Gardevoir VMAX 17/73Champion's Path2020$4.45$20.00$42.102,4593,24976%––-8.6%–2.1×
Mega Gardevoir ex 159/132Mega Evolution2025$4.80$22.50$42.003,2255,47759%2777-5.9%–1.9×
Gardevoir V 16/73Champion's Path2020$2.09$8.00$40.807301,23659%03-1.1%–5.1×
Mega Gardevoir ex 60/132Mega Evolution2025$0.60$15.99$33.606651,17357%1437-3.0%–2.1×

Gem rate from 20 PSA-graded copies. 30d move is the PSA 10 price over 28 days. Premiums need both prices at $5 or more. 1st Edition and Shadowless printings are their own rows, with their own prices and PSA counts; PSA's sales record is kept per card, so they show no sales count.

Cite these figures

UltraBall tracks 53 Gardevoir cards with a PSA 10 price, with a combined PSA 10 population of 62,751. Across the 50 Gardevoir cards with at least 100 PSA-graded copies, the median gem rate is 27%. PSA's sales record shows 1,232 Gardevoir PSA 10 sales worth $1,001,410 in the 90 days to Oct 3, 2026, across the 44 of those cards it has sales for.

Source: UltraBall, ultraball.com/pokemon/gardevoir/psa-10, observed Oct 15, 2026. Sample: every English Gardevoir card UltraBall tracks (56); populations from PSA's population report; sales from PSA's cert-linked sales record. Method below.

How these figures are made

Population
PSA's population report for each card, as PSA publishes it. Copies sent in, not copies in existence.
Gem rate
PSA 10s over every PSA-graded copy. Shown from 20 graded; ranked, and used in medians, from 100.
Prices
UltraBall's PSA 10, PSA 9 and raw near-mint prices, the same as each card page shows. A price leaves out sales far from the rest.
Sales
Cert-linked PSA 10 sales: each tied to one slab by its PSA certificate number, so a sale is this card at this grade. The record has sales for 44 of the 56 Gardevoir cards; the rest show “–”, not zero. 30 and 90 days count back from the newest sale on the record.
Matching
Raw and graded figures are for the same card; a 1st Edition or Shadowless printing is kept apart from the Unlimited card.
Liquidity
PSA 10 sales in 30 days over live listings; days of supply is live listings over the average daily sales.

The full UltraBall methodology

More on Gardevoir and PSA grading

Common questions

What is the most expensive Gardevoir PSA 10?

Gardevoir 109/108 from Dark Explorers, at about $33,900 in PSA 10. Next is Gardevoir ex 96/100 (Sandstorm) at $22,000.

How many Gardevoir PSA 10s are there?

PSA has graded 62,751 Gardevoir cards a 10, out of 155,881 Gardevoir cards it has graded in all, across the 56 cards UltraBall tracks. Gardevoir ex 233/91 (Paldean Fates) is the most graded, at 22,463 copies.

Which Gardevoir card is hardest to grade PSA 10?

Of the Gardevoir cards with at least 100 copies graded, Gardevoir-EX 155/160 (Primal Clash) has the lowest gem rate: 1.9% of 414 came back a 10.

Which Gardevoir has the lowest PSA 10 population?

Gardevoir 69/195 (Silver Tempest), with 7 PSA 10s out of 15 graded. Few copies have been sent in, so the count says more about submissions than about how hard it grades.

What is the easiest Gardevoir to gem?

Gardevoir VMAX 17/73 (Champion's Path): 76% of its 3,249 PSA-graded copies came back a 10, the highest of the Gardevoir cards with at least 100 graded.

How much more is a Gardevoir PSA 10 worth than a raw copy?

Across the Gardevoir cards with both prices, the median PSA 10 sells for 25× the raw near-mint price. The widest gap is Gardevoir 57/99 (Next Destinies), 650×.