Pokemon Trainer and Breeder.
Generally she is a bitch, very secluded, un-trusting. She has done bad things in the past but at heart she is good, caring for injured Pokemon and those which have been abused by their owners. Her own pokemon she has rescued and she only has the two. She didn't really see the point of pokemon until the age of 15 when she came across a Sentret which had been abandoned by its owner in the woods. It was only a baby just out of the egg, weak its owner had abandoned the young animal. She picked it up and took it home to the despair of her parents.
She was kicked out and wandered for a year with Sentret, becoming stronger and fighting other trainers which got in her way. Then one day she watched some boys having a race between their pokemon. Ponyta came last and as you guess its owner wasn't happy, started hitting and beating the small pony until it gave him a swift burn to the arm. The boy set his other pokemon upon it almost killing it before Sentret and Alyssa came along, fought off the boy and took the Ponyta in herself.
She carry's only 3 pokeballs. 2 for her own pokemon and a spare if she comes across and injured or abandoned. She swears never to catch a wild pokemon as she feels that's where they belong. She also carries a camping kit and equipment on a big rucksack and saddle bag which she uses with ponyta.