May's Glaceon (Japanese: ハルカのグレイシアHaruka's Glacia) was the seventh Pokémon obtained by May.
Glaceon was hatched as an Eevee in Time Warp Heals All Wounds from an egg May received from a day-care worker in May's Egg-Cellent Adventure. Since then, she had become a major part of May's team, watching every one of May's contests since it has hatched.
Eevee made her contest debut in What I Did for Love, where she went up against Brock and his Marshtomp. Although Marshtomp, being part Ground-type, could detect where Eevee was when she used Dig, Eevee eventually scored a win for May.
In Strategy With a Smile!, May used Glaceon in the finals of the Wallace Cup, where she went up against Dawn's Piplup. The battle concluded with Dawn as the winner, though Glaceon lost the match by only a few points. During this time, Dawn herself (when she first saw it) commented that Glaceon was very cute.