Serena

Serena (Japanese: セレナ Serena) is a Pokémon Trainer from the Kalos region and one of Ash's traveling companions. Her goal is to become a top-class Pokémon Performer. She and Ash met before the start of the series when Ash aided her in her time of need.

She developed a crush on him from that day on and it is one of her most notable characteristics, evidenced by her blushing whenever she looks at or talks to him.

It is yet to be seen whether or not she follows Ash to Alola, but it is highly unlikely.