The most valuable card illustrated by Masako Yamashita is Growlithe (Skyridge) at $150, ahead of Charmander ($133) and Porygon ($125).
Value counts each card once at its highest-priced printing. The homepage leaderboard additionally requires a priced rarity cohort, so its totals run slightly leaner.
By TCGplayer market price, the most valuable Masako Yamashita card is Growlithe (Skyridge) at $150, followed by Charmander (Expedition Base Set) $133, Porygon (Aquapolis) $125, Porygon (Aquapolis) $112, Dugtrio (Expedition Base Set) $82. Prices are TCGplayer market for raw copies (any condition) and refresh daily.
TickerMint tracks 25 Pokemon cards illustrated by Masako Yamashita across 25 printings, with a combined market value of $1,167 counting each card once at its priciest printing.