Agreed with Lisia, when I first encountered her she was VERY annoying and I was like "Shut up! I want to get to Mauville already!" and her theme music is also annoying to listen to. If anything she just exists to delay your journey and nothing more.
Also, NPC's all over Hoenn won't stop bragging about her, like how the Trainer Fan Club in Lilycove is now a Contest Fan Club that worships her like a goddess of sorts and they always talk about how great she is, even one NPC in Sootopolis who asks you if you or Lisia is more popular and he'll give you a TM (guess which the correct answer is to get the TM...)
Does this character even NEED to exist at all? Aarune is fine, but Lisia is just obnoxious, which is a wonder I have barely participated in contests since I've started the game.