She was not shown in Aaron's battle against Cynthia but she was seen when Aaron was training for that battle so presumably she was one of the Pokémon Aaron used to battle the Champion, even though she did not appear on screen.
|Slash||A Trainer and Child Reunion!|
|Gust||A Trainer and Child Reunion!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.