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Reposting from an older thread.
Eevee is a fighter that would make up for its lack of outstanding strengths through its evolutions. Each one has its own animations and style.
Eevee: Small and hard to hit, but short reach. Balanced in most aspects.
Vaporeon: Can take immense punishment before being KO'd.
Jolteon: Fastest ground speed and heavily combo-oriented.
Flareon: Highest average attack power.
Espeon: Tipper mechanic (attacks deal more damage if properly spaced). Great overall mobility.
Umbreon: Best aerial mobility, and better evasive maneuvers. Brushes off weak attacks at low percents.
Leafeon: Consistently long reach on attacks that can better cancel out other attacks.
Glaceon: Highest average special attack power. Somewhat higher weight.
Sylveon: Longest attack and grab reach but worst mobility. Strongest throws.
Tilts, aerials, and jabs are largely the same.
>Forward Smash: Double-Edge.
>Up Smash: Backflip that strikes with the tail.
>Down Smash: Iron Tail that hits front, then back.
>Special: Projectiles that match the evolutions' types. Swift/Hydro Pump/Thunderbolt/Flamethrower/Psychic/Dark Pulse/Psyshock/Leaf Storm/Ice Beam/Moonblast
>Up Special: Uses their elemental type to propel diagonally upward.
>Side Special: Usually a reflector, command grab, or defensive move.
>Down Special: Evolve - Dial in which the evolution can be chosen. May revert or change evolution after 15 seconds have passed, but is not forced.
Final Smash: Extreme Evoboost - The evolutions power up Eevee, who then uses Last Resort to send the opponent flying.