I really like a lot of eeveelutions, so it becomes really difficult to choose! I love both Glaceon and Leafeon because they're in the classic Gen IV style, but I also love Umbreon and Espeon for a similar reason, as well as their inclusion in Pokémon Colosseum, which is my favourite game in the series. Flareon is really cute, whereas Vaporeon is sleek. Sylveon always has a special place in my heart too, as its reveal in the Gen VI hype train was done so expertly, and XY was my first time really getting involved in the speculation. I always have a hard time narrowing down my favourite eeveelution. From each generation, my favourite in Gen I is Flareon, my favourite in Gen II is Umbreon and my favourite Gen IV is an absolute tie!