May received an Egg from a Day-Care worker named Christopher in May's Egg-Cellent Adventure, which hatched into an Eevee in Time Warp Heals All Wounds. Since then, it became a major part of May's team, watching every one of May's Contests since it hatched.
Eevee made its Contest debut in What I Did for Love, in which it went up against Brock and his Marshtomp. Although Marshtomp could use its fins to sense Eevee's underground movements and detect exactly where it would come up after using Dig, Eevee eventually scored a win for May.
Eevee also took part in the Battle Round of the Kanto Grand Festival in Thinning the Hoard!, in which it showed great battling skills and impressive synchronicity with May's Munchlax, being able to combine its attacks with Munchlax's to take down Harley's Cacturne and Wigglytuff.
Eevee appeared again in Once More With Reeling! to perform in the Appeals Round of the unofficial Terracotta Town Contest, where it proved to be a great performer, coming in first for the appeals and allowing May to compete in the Battle Round.
In A Full Course Tag Battle!, May introduced her newly evolved Pokémon soon after she got reunited with the gang. She revealed that her Eevee evolved into a Glaceon by coming into contact with the Ice Rock near Snowpoint City. During this time, Dawn herself (when she first saw it) commented that Glaceon was very cute.
Glaceon with May
touching the Ice Rock that makes it evolve
It was called out once again in order to help out Roman and Kylie in retrieving the restaurant's stolen food, where it battled alongside Dawn's Buneary. Both of them started off with a double Ice Beam, causing James's Carnivine and Jessie's Seviper to freeze. Followed by its Iron Tail and Buneary's Bounce, they blasted off their opponents.
In Strategy With a Smile!, May used Glaceon in the finals of the Wallace Cup, where it went up against Dawn's Piplup, in its first battle as a Glaceon. The fierce battle concluded with Dawn as the winner, though Glaceon lost the match by only a few points. Although Glaceon was sad, May said that it was great.
Personality and characteristics
As an Eevee, it had the typical traits of its species: playful demeanor, affection for its Trainer, and loyalty. It was also quite energetic. Being a recently hatched Pokémon at the time, Eevee had great curiosity as shown by its fascination for the ocean.
Upon evolution, its personality changed moderately. While Glaceon retained its loyalty and affection for its Trainer, its playful demeanor had been replaced by a more assertive and slightly aggressive one that shows mostly during battle.
| Using Shadow Ball|
as an Eevee
| Using Ice Shard
| A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
- Focus-Ball was first used in a Double Battle with Harley in Thinning the Hoard!. Eevee would use Shadow Ball and Munchlax would use Focus Punch. The energy from the Focus Punch would fuse with the Shadow Ball and hit the opponent with the power of the Shadow Ball and the Focus Punch.
- Focus Punch Combination was used to deliver the final blow to Harley's Wigglytuff in Thinning the Hoard!. Eevee would use its tail to toss Munchlax up and Munchlax would then uses Focus Punch to hit the enemy.
- Of all Pokémon that debuted as Eggs, Glaceon took the longest to hatch, at 7 episodes.
For more information on this Pokémon's species, see Eevee and Glaceon.