Mew

 is a legendary pokemon. While it is technically a wild pokemon, it is often affiliated with Justin the Dog, and serves as his pokemon when neccessary.

History
At some point, Justin came across Mew accidentally, while it was injured. Justin nursed Mew back to health, and then let it free. However, Mew wanted to stay with Justin, and stole a pokeball from a Poke Mart, so it could be Justin's pokemon. However, Justin didn't feel right about keeping Mew as his own pokemon, so he refused. However, he did agree to let Mew stay with him and visit whenever it wanted, and Mew acts as Justin's pokemon in trainer battles.

Personality
Mew has an innocent yet michevious personality. It is extremely curious, and won't hesitate to investitage something it finds amusing. Mew has a free spirit, and travels around the entire world exploring, sometimes causing a bit of mischief by pulling pranks. Despite it's "cute" personality, Mew is quite ruthless in battle, not hesitating to go all-out against opponents, and use whatever means neccessary to come out victorious.

Abilities
Being a legendary pokemon, Mew is quite powerful, despite it's small size and cute appearance. It is extremely fast and surprisingly strong, able to lift small or medium-sized boulders without psychic powers. However, it's true strength lies in it's numerous powers, psychic or otherwise. Mew is capable of long-term flight at high speeds, transforming itself, cloaking, and is able to form barriers of psycic energy around itself and others. Due to its small size and great speed, Mew is also incredibly evasive, and very difficult to hit.