Somebody considers Eevee is a main series starter Pokémon (like Mudkip and Snivy), while others are not. Eevee is a starter Pokémon in Pokémon Yellow (as a rival's starter), Pokémon XD: Gale of Darkness and Pokémon Conquest, and like all starters (excluding Pikachu), having a gender ratio of seven males to one female. But some guys treated this as a regular Pokémon instead of starters.
In my opinion, I'll still considering Eevee as a main-series starter Pokémon because of same reason. Now, it's your turn (as the title says).