Just from the first paragraph of the story, I like it. Hope you're still open to new members.
Name: Lilith
Gender: Female
Species: Eevee
Ability: Adaptability, Anticipation
Starting Level: 10
Starting Moveset: Tackle, Helping Hand, Baby-Doll Eyes, Swift
Personality: Lilith tends to be fairly simple-minded and childish on most occasions but can have moments of clear and mature thinking under strained circumstances. Though still in adolescence, Lilith preforms well under pressure and enjoys facing challenges. She is not in any hurry to grow up, refusing to settle for an evolution on convenience. She enjoys her youth and knows it's fleeting, trying to maintain her own innocence for as long as she can manage; that is, hoping to train her current evolutionary form to the best of her ability before taking on a permanent, stronger form. When confronted by strangers for the first time, Lilith is cautious and tries to keep her guard up. However, once she's warmed up to someone she becomes more herself, rather quirky and energetic. Being young, however, leaves Lilith with various insecurities. When she feels she is unable to emotionally deal with her surroundings, she puts up a facade to keep up her cheerful attitude in front of others.
Brief History: Lilith was born into a family for the purpose of evolving and mastering the skills of a predetermined evolution. She was born in a life where being you were but a means to an end. She grew up in specialized in training and raising Pokemon for situational jobs. Her siblings were rented out to those who required the use of specialty type Pokemon for undisclosed purposes. They considered themselves Mercenaries, doing jobs others did not want their loved ones involved in. Lilith had a strong relationship with her mother and thought the world of her. The only trouble she ever got was from her siblings, ridiculing and teasing her for not evolving. Often times they would try to pressure her into becoming their evolutionary forms, claiming to be the best one of all. This, however, only intensified Lilith's desire to surpass them in an inferior form. Lilith was meant to evolve into an Umbreon, something her mother kept secret from her for quite some time. It wasn't until Lilith discovered this fact that she felt the need to break away from the family. She felt as though her life was mapped out for her, rather than being able to make her own life decisions. Leaving wasn't difficult--it wasn't a jail.
She left, leaving behind the only person she knew who cared for her as well as the siblings who helped her grow stronger. She went out into the world inexperienced and full or curiosity, wandering the region until she found herself somewhere new. She walked the land foraging and nesting whenever possible, training in solitude until the day she finds who and what she's meant to become.