Angelina’s aura powers are strictly set around communicating her emotions to other living creatures (Pokémon and Humans alike) as well as being able to understand them through an aura connection. Her power is similar to that of a Lucario’s, but she lacks their offensive capabilities. She cannot harm anyone with her aura powers; instead, they give her great emotional depth to those she connects with. Angelina cannot intrude into other peoples’ emotions or minds or sense their inner emotions without permission first, since her aura powers require acceptance and openness in order to create a connection in the first place. Her aura powers allow her to have a natural talent for communicating with Pokémon in particular, which allows her to slightly trespass the language barrier via the translation of emotions and reactions without the use of languages.
At the age of 6, Angelina was originally thought to have Asperger’s (mostly due to the emotional sensitivity brought on by her emerging aura powers) and was brought to an experienced psychiatrist for an exam. The physician discovered that actually she had aura powers. Angelina’s family, quite fortunately, had a family of lucarios that loyally stayed as companions to them. Most of these lucarios knew the natural language of the family--Polish. And one of them, noticing that Angelina was developing Aura abilities, came forth to teach her how to harness her Aura powers. She learned from the Lucario for up to 10+ years. By the time she started her journey to the Unovan Pokémon League she had learned enough about how to harness and control her aura abilities to continue her learning on her own. Even after years of training, however, she still has a strong emotional sensitivity towards other people--especially to those she shares an aura connection with. On another note, this would also allow her to see and sense the shadowy aura of Infected or Undead Pokémon.
So this is the concept of her aura powers. Aura-using humans have been revealed as being canon due to the presence of the aura-wielding human Riley in the main games, but I was not sure if human aura users were allowed at all here on EJ. Oh, and sorry for the long-winded explanation, Admins; I just want to assure you that I am taking great steps in avoiding any god-moding with this character :U