The most valuable card illustrated by Hikaru Koike is Lugia ex (Unseen Forces) at $2,500, ahead of Blastoise ex ($650) and Rocket's Scizor ex ($600).
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 Hikaru Koike card is Lugia ex (Unseen Forces) at $2,500, followed by Blastoise ex (FireRed & LeafGreen) $650, Rocket's Scizor ex (Team Rocket Returns) $600, Arcanine ex (Legend Maker) $482, Rayquaza ex (Dragon) $461. Prices are TCGplayer market for raw copies (any condition) and refresh daily.
TickerMint tracks 47 Pokemon cards illustrated by Hikaru Koike across 48 printings, with a combined market value of $10,650 counting each card once at its priciest printing.