The most valuable Kalos Starter Set card is Snorlax #26, worth about $64.88 in Near Mint condition, followed by Greninja #14 at $16.41 and Miltank #27 at $12.76. These are raw (ungraded) market prices from recent sales, updated daily. Graded copies sell for more; each card's page has its PSA, CGC and BGS prices.