Maybe it's because I've been watching a Kingdom Hearts 2 LP, but this makes Dusknoir look like a concept for a heartless.
What I'm wondering is what defines a Pokemon getting Hyper Voice.
I can accept something like Exploud, where Sound is its thing, or Salamence, which is huge and intimidating and probably has a loud roar. However, two of the Pokemon most famous in the competitive game right now are Sylveon and Gardevoir. Nothing about Eevee (the form that gets the move first) seems like it's particularly cacophonic or ridiculously loud in any way, and Ralts in most depictions seems more like it tries to come off as non-threatening (Growl's original name was something like that) or escape battles (Teleport), so being able to shout so loud it functions as an injuring defense mechanism seems weird.
Gardevoir only makes it stranger because the point of it is to look elegant. I could understand something like Disarming Voice or Sing, things that feel hypnotic or manipulative like a Siren's Song, but Hyper Voice, the only correlation I could make would be if Gardevoir could hit a high note like an Opera singer.