Since Dory’s bloodline is Sinnohian, she does indeed have a Hisui Ancestor. Her name is Reiki and is one of the earliest members of the Joy Family to travel to another region. She’s incredibly interested in medicine and Pokémon, and seemed to be “Close Friends” With Arezu. As an adult she married a man but sure loved spending less time with him and more time with her “best friend” Arezu.

Ilex has an ancestor but not in Hisui, Ilex’s ancestor is probably from the 20s and was a Jazz and later Soul Singer. Her name is Aretha.