Here's why:
* Gameplay mechanics: The Mystery Dungeon games are designed around the idea of a "random" starter Pokémon based on your personality. This provides a unique experience for each player.
* Story relevance: Eevee plays a significant role in the story of the game, especially in *Pokémon Mystery Dungeon: Explorers of Time, Darkness, and Sky*. Having it as a starter would spoil some of the plot twists.
However, you can obtain Eevee later in the game through other means:
* Rescue: You can rescue Eevee from a dungeon.
* Evolution: In some games, you can evolve other Pokémon into Eevee through specific methods.
* Trading: In some games, you can trade with other players to obtain an Eevee.
So, while you can't choose Eevee as your initial partner, you can definitely encounter it later in the game and make it a valuable member of your team.