10/10 The typing's been done but the design is fantastic.
Honestly, Dark/Flying would have fit it better imo.
What about Dark/Dragon???
(BTW, the furry/scalie fandom is sexist for making Hydreigon feature in most fanarts/fanfiction as female.)
If you want to get technical most (if not, every) fan is sexist because we impose gender specific pronouns on every pokemon based on how they look. Really, it's a human trait, nothing to get worked up over.