Yet another member of Andrew's large roster of Pokemon ladies-that's how he rolls. Except for Ken and Leone, those two are the token males :P

But yes, let's see what do we have here...
Aiko used to belong to an old martial arts master and world traveller, who taught her everything he knew before passing away. Taking his old scarf as memento, Aiko continued to travel around the world on her own, perfecting her skills and in meantime, helping those in need or confronting Pokemon thieves like Team Rocket, becoming a sort of legend due to her incredible determination and strength, successfully taking down some tougher trainers and their Pokemon. During one of her travels, she snuck onboard the ship that travelled to Unova, and not long after she found herself on a completely new, unknown territory, she ran into Andrew and a group of his friends, who were surprised to see a Medicham in this region. Andrew did not waste a moment, and prepared 3 of his Pokemon to face her: Priscilla, Keiko and Roxanne. While Roxanne and Priscilla fell down after a vicious fight, Keiko managed to gain the upper hand, noticing flaws in the young Medicham's combat style-she was too chaotic and impatient, allowing herself to become open to some of Keiko's devastating attacks, which soon brought Aiko to her knees. Even with her strength nearly gone, she refused to give up, breaking out of every Pokeball Andrew tossed at her. Only when Keiko delivered the finishing blow was Andrew finally able to catch her. Impressed by Aiko's ability and determination, Keiko requested from Andrew to allow her to teach Aiko alongside Roxanne and Priscilla. Used to working alone, Aiko wasn't so fond of the idea of working in the team at first, but she grew to respect her teammates, and in turn, her new trainer as well, his selflesness, care and dedication to his Pokemon reminding her a bit of her former master.
Mini-facts:
-the scar on her back was from one of her first battles, when she was attacked from behind by a Magmortar she wrongly asumed was defeated. Even if it hurt her like hell, she made the bigger Pokemon regret his actions.
-the bandage over her chest serves not only to cover her breasts, but also to hide said scar on her back. her scarf also covers those parts that the bandage can't.