Many a rumor circulated back in the days of Gen 1 about the peculiar Leaf Stone and its potential effects on Eevee. Flareon, Jolteon, and Vaporeon were available to players looking to check out a new evolutionary path, but you couldn't get a Leafeon from that stone, as it simply didn't exist. These days you can absolutely get yourself a Leafeon, but not with a Leaf Stone. Instead you must level up Eevee when near a Moss Rock. Talk about backwards.