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As reported earlier, the "Play to Befriend a Pokémon!" game at Pokémon.com has the ability to interact with the Pokémon Dream World. When four levels of the game are completed, players can select an Eeveelution to send to the Dream World to be downloaded to the player's Pokémon Black or White Version game.
However, as reported at Pokémon.com, this game won't be around forever—it will be taken down, or at least disconnected from the Pokémon Global Link, on Thursday, May 5.
Once the game is taken down, the Eeveelutions will be available to transfer to Pokémon Black and White from the Pokémon Global Link.