Rooting for best girl May!! X3
This is the first time I’ve ever seen you use their English names.Hikari [Dawn] is clearly very relevant at the moment given the D/P remakes, and Koharu [Chloe] is arguably this series' version of a female traveling companion. I don't think it's any deeper than that.
Koharu and Hikari have nothing going on and she was already there cheering for Satoshi. While with Goh, Hikari took his place.