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 was 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
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
May and her Glaceon
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 While Glaceon retained its loyalty and affection for its Trainer, its playful demeanor had been replaced by a more assertive and slightly aggressive one that shows mostly during battle.
Description: 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.
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.