>>33932497I've explained it a couple of times before. But I guess I'll do you a favor. Ash is the only one who takes cares of Lillie and understands her issues the most, and he does it because he cares about her the most because obviously no one else bothers to do it, you can say its his love of wanting to help Lillie because she loves pokemon just like him. Lillie admires Ash where she wants to learn and study with him, she was especially happy when Ash called her amazing. Lillie trusts him to the point where she is able to talk about her issues and only Ash, it's not easy to open yourself up like this. You would think she would tell her best friend Mao, but its a relationship with Ash that goes beyond that. It's really an adorable couple.
Ironically Serena never had a foundation. She never even considered Ash a friend. It's just a girl with a poor crush that never understood what real love is. Nothing even happened between Ash and Serena.